napsamycin B
3,5,8,11-Tetraazadodecanoic acid, 9-[[[[5-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)dihydro-4-hydroxy-2(3H)-furanylidene]methyl]amino]carbonyl]-2-[(3-hydroxyphenyl)methyl]-10,11-dimethyl-6-[2-(methylthio)ethyl]-4,7,12-trioxo-12-(1,2,3,4-tetrahydro-6-hydroxy-1-methyl-3-isoquinolinyl)-
