(5R)-5-[(1S,2R)-1-formyl-2-hydroxypropyl]-3-[(2-{[(E)-iminomethyl]amino}ethyl)sulfanyl]-4,5-dihydro-1H-pyrrole-2-carbox
ylic acid

IMIPENEM, open form; N-FORMIMIDOYL-THIENAMYCINE, open form

(5R)-5-[(2S,3R)-3-hydroxy-1-oxobutan-2-yl]-3-[(2-{[(E)-iminomethyl]amino}ethyl)sulfanyl]-4,5-dihydro-1H-pyrrole-2-carboxylic acid

(2R)-4-(2-methanimidamidoethylsulfanyl)-2-[(2S,3R)-3-oxidanyl-1-oxidanylidene-butan-2-yl]-2,3-dihydro-1H-pyrrole-5-carboxylic acid