Showing structure for ethyl 4-[(1-{10-acetyl-7-ethoxy-3,11,13-trihydroxy-2,12-dimethyl-5-oxo-8-oxatricyclo[7.4.0.0²,⁷]trideca-1(13),3,9,11-tetraen-4-yl}ethylidene)amino]butanoate