57165-44-3 NSC231997 Thiourea, N-[5,6,7,9-tetrahydro-1,2,3-trimethoxy- 10-(methylthio)-9-oxobenzo(a)heptalen-7-yl]-N'- (2,3,4-tri-O-acetyl-alpha-L-arabinopyranosyl)-, (S)-