(3S)-2-[(2S)-2-[[(2S)-1-ethoxy-1-oxo-4-phenylbutan-2-yl]amino]propanoyl]-3,4-dihydro-1H-isoquinoline-3-carboxylic acid; (S)-2-(((S)-1-ethoxy-1-oxo-4-phenylbutan-2-yl)-L-alanyl)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid; 3-Isoquinolinecarboxylic acid, 2-[(2S)-2-[[(1S)-1-(ethoxycarbonyl)-3-phenylpropyl]amino]-1-oxopropyl]-1,2,3,4-tetrahydro-, (3S) (USP)