• 5-Isobenzofurancarboxylic acid, 1,3-dihydro-1,3-dioxo-,1-methyl-1,2-ethanediyl ester
• 63775-41-7
• C₂₁H₁₂O₁₀
• .

• 5,7-Octadienal
• 17746-89-3
• C₈H₁₂O
• .

• 5-Benzoxazolamine, 2,2'-(5,5-dioxido-3,7-dibenzothiophenediyl)bis-
• 17201-33-1
• C₂₆H₁₆N₄O₄S
• .

• 5H-Thiazolo[3,2-a]pyrimidin-5-one,6-[2-[4-(1,2-benzisoxazol3-yl)-1-piperidinyl]ethyl]-2,3-dihydro-7-methyl-
• 106266-15-3
• C₂₁H₂₄N₄O₂S
• .

• 5,8-Quinolinedione, 7-[[2-(2-hydroxyphenyl)ethyl]amino]-
• 173912-75-9
• C₁₇H₁₄N₂O₃
• .

• 5-Hexenoic acid, 6-[1-[(4-nitrophenyl)methyl]-1H-pyrrol-2-yl]-2,4-dioxo-,ethyl ester
• 692756-18-6
• C₁₉H₁₈N₂O₆
• .

• 5H-Pyrido[2,3-a]phenothiazin-5-one
• 105774-61-6
• C₁₅H₈N₂OS
• .

• 5,6-Dithia-2,9-diazadecanedioic acid, bis(1,1-dimethylethyl) ester,5,5-dioxide
• 614760-36-0
• C₁₄H₂₈N₂O₆S₂
• .

• 5H-[1]Benzopyrano[4,3-d]pyrimidin-5-ol, 2-[(4-pyridinylmethyl)amino]-,dihydrochloride
• 61466-32-8
• C₁₇H₁₄N₄O₂·2ClH
• .

• 5H-[1]Benzopyrano[4,3-d]pyrimidin-5-ol, 2-(methylthio)-
• 61466-34-0
• C₁₂H₁₀N₂O₂S
• .

• 5H-[1]Benzopyrano[4,3-d]pyrimidin-5-ol, 2-methoxy-
• 61466-36-2
• C₁₂H₁₀N₂O₃
• .

• 5H-[1]Benzopyrano[4,3-d]pyrimidin-5-one, 2-(methylthio)-
• 61466-39-5
• C₁₂H₈N₂O₂S
• .

• 5H-[1]Benzopyrano[4,3-d]pyrimidin-5-one, 8-methyl-2-(methylthio)-
• 61466-40-8
• C₁₃H₁₀N₂O₂S
• .

• 5(4H)-Oxazolone, 2-(4-chlorophenyl)-4-(1H-indol-3-ylmethylene)-
• 101966-90-9
• C₁₈H₁₁ClN₂O₂
• .

• 5-(2,2-dimethyl-1,3-dioxolan-4-yl)-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-6-yl bis(aziridin-1-yl)phosphinate (non-preferred name)
• 61927-14-8
• C₁₆H₂₇N₂O₇P
• 390.3685
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindolium, 2,3-dimethyl-, perchlorate
• 61928-36-7
• C₁₁H₁₂N₃·ClO₄
• .

• 5-Quinolinol, 3-[2-(4-chlorophenyl)ethenyl]-
• 63785-84-2
• C₁₇H₁₂ClNO
• .

• 5-oxo-L-proline, compound with 2-amino-1,5-dihydro-1-methyl-4H-imidazol-4-one (1:1)
• 63791-44-6
• C₉H₁₄N₄O₄
• 264-463-2
• 242.2319
• .

• 5-Heptenoic acid,7-[3-(4-cyclohexyl-3-hydroxy-1-butenyl)bicyclo[2.2.1]hept-5-en-2-yl]-,methyl ester
• 63794-28-5
• C₂₅H₃₈O₃
• .

• 5-Heptenoic acid,7-[3-(3-hydroxy-4-phenoxy-1-butenyl)bicyclo[2.2.1]hept-5-en-2-yl]-,methyl ester
• 63794-32-1
• C₂₅H₃₂O₄
• .

• 5-Heptenoic acid,7-[3-[3-[(tetrahydro-2H-pyran-2-yl)oxy]-1-octenyl]bicyclo[2.2.1]hept-5-en-2-yl]-, methyl ester
• 63794-39-8
• C₂₈H₄₄O₄
• .

• 5-Thiazolecarboxylic acid,2-[4-[[(4-hydroxy-3-methoxyphenyl)methylene]amino]phenyl]-4-methyl-,ethyl ester, monohydrochloride
• 64209-85-4
• C₂₁H₂₀N₂O₄S·ClH
• .

• 5-Hexen-2-ynal, 4-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-5-methyl-, (S)-
• 139057-28-6
• C₂₃H₂₆O₂Si
• .

• 5H-Tetrazole-5-thione, 1-(2,3-dichlorophenyl)-1,2-dihydro-
• 139059-02-2
• C₇H₄Cl₂N₄S
• .

• 5H-Tetrazole-5-thione, 1,2-dihydro-1-(3-iodophenyl)-
• 139059-04-4
• C₇H₅IN₄S
• .

• 5(1H)-Quinolinone, 4-benzoyl-4,6,7,8-tetrahydro-7,7-dimethyl-2-phenyl-
• 54398-78-6
• C₂₄H₂₃NO₂
• .

• 5(6H)-Quinolinone, 4-benzoyl-7,8-dihydro-2-phenyl-
• 54398-83-3
• C₂₂H₁₇NO₂
• .

• 5-methylproline
• 16639-15-9
• C₆H₁₁NO₂
• 129.157
• .

• 5,12-Naphthacenedione, 1,2,3-tris(1,1-dimethylethyl)-
• 140837-74-7
• C₃₀H₃₄O₂
• .

• 5H-Oxazolo[2,3-a]isoquinolin-5-one,2,3,6,10,10b-tetrahydro-10b-(4-methoxyphenyl)-
• 64262-34-6
• C₁₈H₁₇NO₃
• .

• 5-Benzofuranol, 2,3-dihydro-2-(4-morpholinyl)-3-[(trimethylsilyl)methyl]-,trans-
• 105686-47-3
• C₁₆H₂₅NO₃Si
• .

• 5H-Benzimidazol-5-one, 6-benzoyl-1,6-dihydro-
• 105686-59-7
• C₁₄H₁₀N₂O₂
• .

• 5-Tetradecene, 14-bromo-
• 62871-10-7
• C₁₄H₂₇Br
• .

• 5-Isoxazolecarboxylic acid, 3-ethyl-4,5-dihydro-, ethyl ester
• 57065-98-2
• C₈H₁₃NO₃
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindole, 3-methyl-
• 61928-33-4
• C₁₀H₉N₃
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindole, 3-methyl-, monoperchlorate
• 61928-34-5
• C₁₀H₉N₃·ClHO₄
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindole,5-[(1-methyl-2(1H)-quinolinylidene)ethylidene]-, monoperchlorate
• 61928-38-9
• C₂₁H₁₆N₄·ClHO₄
• .

• 5-Thiazoleacetamide, 2,4-dimethyl-
• 61928-55-0
• C₇H₁₀N₂OS
• 170.2321
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindole
• 61928-56-1
• C₉H₇N₃
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindole, monoperchlorate
• 61928-58-3
• C₉H₇N₃·ClHO₄
• .

• 5H-1,2,4-Triazolo[3,4-a]isoindolium, 2-ethyl-, perchlorate
• 61928-62-9
• C₁₁H₁₂N₃·ClO₄
• .

• 5-Hexenoyl chloride, 6,6-difluoro-
• 136103-88-3
• C₆H₇ClF₂O
• .

• 5-cyclopropyl-1-(ethoxymethyl)-6-(phenylsulfanyl)-2-thioxo-2,3-dihydropyrimidin-4(1H)-one
• 136160-37-7
• C₁₆H₁₈N₂O₂S₂
• 334.4563
• .

• 5-acetyl-7,8-dimethoxy-4,5-dihydropyrrolo[1,2-a]quinoxaline-1-carbaldehyde thiosemicarbazone
• 56722-08-8
• C₁₇H₁₉N₅O₃S
• 373.4295
• .

• 5-(4-chlorophenyl)-3-[(1-methylethyl)amino]dihydrofuran-2(3H)-one hydrochloride
• 139084-74-5
• C₁₃H₁₇Cl₂NO₂
• 290.1856
• .

• 5-(4-chlorophenyl)-3-[(3-hydroxypropyl)amino]dihydrofuran-2(3H)-one hydrochloride
• 139084-77-8
• C₁₃H₁₇Cl₂NO₃
• 306.185
• .

• 5-(4-chlorophenyl)-3-piperidin-1-yldihydrofuran-2(3H)-one hydrochloride
• 139084-79-0
• C₁₅H₁₉Cl₂NO₂
• 316.2229
• .

• 5-(4-chlorophenyl)-3-[4-(2-hydroxyethyl)piperazin-1-yl]dihydrofuran-2(3H)-one dihydrochloride
• 139084-81-4
• C₁₆H₂₃Cl₃N₂O₃
• 397.7244
• .

• 5-(4-chlorophenyl)-3-[(2-hydroxyethyl)amino]dihydrofuran-2(3H)-one hydrochloride
• 139084-76-7
• C₁₂H₁₅Cl₂NO₃
• 292.1584
• .

• 5-(4-chlorophenyl)-3-(4-methylpiperazin-1-yl)dihydrofuran-2(3H)-one dihydrochloride
• 139084-80-3
• C₁₅H₂₁Cl₃N₂O₂
• 367.6984
• .