(.ALPHA.S,2R,5Z)-4-CARBOXY-2,5-DIHYDRO-5-(4-HYDROXYBUTYLIDENE)-.ALPHA.-((1R)-1-HYDROXYETHYL)-2-THIAZOLEACETIC ACID
(.alpha.s,2r,5z)-4-carboxy-2,5-dihydro-5-(4-hydroxybutylidene)-.alpha.-((1r)-1-hydroxyethyl)-2-thiazoleacetic acid