142383-44-6 2H-Xantheno(2',3':6,7)(1,3)benzodioxino(4,5-fg)isoquinoline-1,15-dione, 3-ethyl-7a,8,11,12,13,14-hexahydro-11,14,16,17-tetrahydroxy-9-methoxy-2-methyl-, (7aalpha,11beta,14alpha)- Sch 42137 Sch-42137