Synonyms: (5Z,11α,13E,15S)-11,15-Dihydroxy-9-oxoprosta-5,13-diene-1-oic acid 1,15-lactone;(5Z,13E,15S)-11α,15-Dihydroxy-9-oxoprosta-5,13-dien-1-oic acid 1,15-lactone;(5Z,13E,15S)-9-Oxo-11α,15-dihydroxyprosta-5,13-diene-1-oic acid 1,15-lactone;(5Z,8R,13E,15S)-11α,15-Dihydroxy-9-oxoprosta-5,13-diene-1-oic acid 1,15-lactone;PGE2-1,15-lactone