label: prosta-5,13-dien-18-yn-1-oic acid, 6,9-epoxy-7,7-difluoro-11,15-dihydroxy-16,20-dimethyl-, monosodium salt, (5Z,9alpha,11alpha.,13E,15S,16S)-
label_lc: prosta-5,13-dien-18-yn-1-oic acid, 6,9-epoxy-7,7-difluoro-11,15-dihydroxy-16,20-dimethyl-, monosodium salt, (5z,9alpha,11alpha.,13e,15s,16s)-