Synonyms: 1,3-Propanediamine,N-[(3,4-dihydro-2H-1-benzopyran-2-yl)methyl]-N'-(1,4,5,6-tetrahydro-2-pyrimidinyl)-,dihydrochloride, (R)-; 1,3-Propanediamine,N-[[(2R)-3,4-dihydro-2H-1-benzopyran-2-yl]methyl]-N'-(1,4,5,6-tetrahydro-2-pyrimidinyl)-,dihydrochloride (9CI); Alniditan dihydrochloride; R 91274