1,3-Dioxo-1H-benz(de)isoquinoline-2(3H)-butanoic acid 1,3-Dioxo-1H-benz(de)isoquinoline-2(3H)-butyric acid 1H-Benz(de)isoquinoline-2(3H)-butanoic acid, 1,3-dioxo- 4-(N-(1,8-naphthalimide))-n-butyric acid 88909-96-0 Isodibut Virstatin