(S)-7-Amino-6,7-dihydro-1,2,3,10-tetramethoxybenzo(a)heptalen-9(5H)-one 36191-19-2 Benzo(a)heptalen-9(5H)-one, 7-amino-6,7-dihydro-1,2,3,10-tetramethoxy-, (S)-, (R-(R*,R*))-2,3-dihydroxybutanedioate (2:1) Trimethyl colchicinic acid methyl ether