label: 1,9-dioxo-11 alpha,15 alpha-dihydroxy-1-hydroxymethyl-16-phenoxy-17,18,19,20-tetranor-5,13-prostadiene
label_lc: 1,9-dioxo-11 alpha,15 alpha-dihydroxy-1-hydroxymethyl-16-phenoxy-17,18,19,20-tetranor-5,13-prostadiene