Replacement of the carboxylic acid group of prostaglandin f(2alpha) with a hydroxyl or methoxy substituent provides biologically unique compounds. - Woodward DF; Krauss AH; Chen J; Gil DW; Kedzie KM; Protzman CE; Shi L; Chen R; Krauss HA; Bogardus A; Dinh HT; Wheeler LA; et al. (British journal of pharmacology, 2000)