A compound comprising or a pharmaceutically acceptable salt or a prodrug thereof, wherein the dashed line represents the presence or absence of a double bond; J is C═O or CHOH; A is —(CH2)6—, or cis —CH2CH═CH—(CH2)3—, wherein 1 or 2 carbons may be substituted with S or O; B is CO2H, or CO2R, CONR2, CONHCH2CH2OH, CON(CH2CH2OH)2, CH2OR, P(O)(OR)2, CONRSO2R, SONR2, or R is H, C1-6 alkyl; D is —(CH2)n—, —X(CH2)n, or —(CH2)nX—, wherein n is from 0 to 3 and X is S or O; and E is an aromatic or heteroaromatic moiety having from 0 to 4 substituents, said substituents each comprising from 1 to 6 non-hydrogen atoms is disclosed herein. Methods, compositions, and medicaments related thereto, as well as experimental results showing prostaglandin EP4 selective agonist activity for certain compounds disclosed herein, are also disclosed.