3-Maleimidobenzoyl (digoxigenin-3-O-succinamido)aniline 75804-34-1 Card-20(22)-enolide, 3-(4-((4-((3-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)benzoyl)amino)phenyl)amino)-1,4-dioxobutoxy)-12,14-dihydroxy-, (3beta,5beta,12beta)- MIBDS m-Maleimidobenzoyl digoxigenin-3-O-succinate