Showing structure for 2-[(5-{[(1r,2r,4as,8as)-1,2,4a,5-tetramethyl-1,3,4,7,8,8a-hexahydronaphthalen-2-yl]methyl}-6-hydroxy-3,4-dioxocyclohexa-1,5-dien-1-yl)amino]ethanesulfonic acid