(5Z,11α,13E,15R)-11,15-Dihydroxy-16,16-dimethyl-9-oxoprosta-5,13-dien-1-oic acid;Prosta-5,13-dien-1-oic acid, 11,15-dihydroxy-16,16-dimethyl-9-oxo-, (5Z,11α,13E,15R)-;16,16-Dimethyl Prostaglandin E2,(5Z,11α,13E,15R)-11,15-Dihydroxy-16,16-dimethyl-9-oxo-prosta-5,13-dien-1oicacid