Synonyms: 2H-Pyran-3(6H)-one,2-[[(3b,20S)-20-[[5-[(2,6-dideoxy-3-O-methyl-b-D-ribo-hexopyranosyl)oxy]octahydro-4-methoxy-6,9'-dimethylspiro[2H-pyran-2,3'(4'H)-[7H]pyrano[3,4-c][1,2,5]trioxepin]-7'-yl]oxy]-17-hydroxypregn-5-en-3-yl]oxy]-4-methoxy-6-methyl-,[3'S-[3'a(4S*,5S*,6S*),5'ab,7'a(6S*),9'a,9'aa]]-; Pregnane, 2H-pyran-3(6H)-onederiv.; Spiro[2H-pyran-2,3'(4'H)-[7H]pyrano[3,4-c][1,2,5]trioxepin],2H-pyran-3(6H)-one deriv.; Periplocoside C