1'-Butyl 2,4'-nitrosiminodibenzoate 2-((4-(Butoxycarbonyl)phenyl)nitrosoamino)benzoic acid 20943-47-9 BRN 1827549 Benzoic acid, 2,4'-nitrosiminodi-, 1'-butyl ester (8CI) Benzoic acid, 2-((4-(butoxycarbonyl)phenyl)nitrosoamino)- ITF 615