1 2AX (3r,4r,5ar,11ar)-3-methyl-6,11-dioxo-2,3,4,5,5a,6,11,11a-octahydrothiepino[3,2-G]isoquinoline-4-carboxylic acid 1.000 2 HG6 4-chloranyl-9,10-bis(oxidanylidene)anthracene-2-carboxylic acid 0.708