Showing structure for [(1s,13s,15s)-8,15-dihydroxy-13-methoxy-1-methyl-12,17-dioxo-14-oxapentacyclo[11.6.1.0²,¹¹.0⁴,⁹.0¹⁶,²⁰]icosa-2,4,6,8,10,16(20)-hexaen-5-yl]oxidanesulfonic acid