1 6B7 (2~{R},3~{R},4~{R})-4-methyl-3-(2-oxidanylidene-2-propoxy-ethyl)sulfanyl-5-[(2~{S},3~{R})-3-oxidanyl-1-oxidanylidene-butan-2-yl]-3,4-dihydro-2~{H}-pyrrole-2-carboxylic acid 1.000 2 59I (2r,3r)-3-methyl-4-(2-oxidanylidene-2-propan-2-yloxy-ethyl)sulfanyl-2-[(2r)-3-oxidanyl-1-oxidanylidene-butan-2-yl]-2,3-dihydro-1h-pyrrole-5-carboxylic acid 0.917 3 6B8 (2s,3r,4r)-2-[(2s,3r)-3-hydroxy-1-oxobutan-2-yl]-3-methyl-4-(methylsulfanyl)-3,4-dihydro-2h-pyrrole-5-carboxylic acid 0.739