1,3-dihydroxy-2-(hydroxymethyl)propan-2-aminium (5Z,9α,11β,13E,15S)-9,11,15-trihydroxy-15-methylprosta-5,13-dien-1-oate
(15S)-9a, 11a, 15-Trihydroxy-15-methyl-prosta-cis-5, trans-13-dienoic Acid Tromethamine Salt