(S)-7-Amino-10-ethoxy-6,7-dihydro-1,2,3-trimethoxybenazo(a)heptalen-9(5H)-one 36191-20-5 Benazo(a)heptalen-9(5H)-one, 7-amino-10-ethoxy-6,7-dihydro-1,2,3-trimethoxy-, (S)-, (R-(R*,R*))-2,3-dihydroxybutanedioate (2:1)