156429-11-7 FL-120B Propanoic acid, 2-methyl-, 9-diazo-1a,3,8,9,10,10a-hexahydro-2,7-dihydroxy-10a-methyl-3,8-dioxo-2H-benzo(6,7)fluoren(2,3-b)oxiren-10-yl ester, (1aS-(1a-alpha,2-beta,10-beta,10a-alpha))-