AC-PLG-SCH[CH2CH(CH3)2]-CO-LG-OC2H5 AC-PRO-LEU-GLY-(2-MERCAPTO-4-METHYLPENTANOYL)-LEU-GLY-OET AC-PRO-LEU-GLY-[(S)-2-MERCAPTO-4-METHYL-PENTANOYL]-LEU-GLY-OET AC-PRO-LEU-GLY-SCH[CH2CH(CH3)2]-CO-LEU-GLY-OC2H5 GELATINASE A/GELATINASE B SUBSTRATE II MMP-2/MMP-9 SUBSTRATE II MMP COLORIMETRIC SUBSTRATE I ethyl 2-[[(2S)-2-[[(2S)-2-[2-[[(2S)-2-[[(2S)-1-acetylpyrrolidine-2-carbonyl]amino]-4-methylpentanoyl]amino]acetyl]sulfanyl-4-methylpentanoyl]amino]-4-methylpentanoyl]amino]acetate