methyl 3-[3-[[(2S)-4-amino-4-oxo-2-(quinoline-2-carbonylamino)butanoyl]amino]-2-hydroxy-4-phenylbutyl]-1,4,4a,5,6,7,8,8a-octahydrophthalazine-2-carboxylate;methyl 3-[3-[[(2S)-4-amino-4-oxo-2-(quinoline-2-carbonylamino)butanoyl]amino]-2-hydroxy-4-phenylbutyl]-1,4-dihydrophthalazine-2-carboxylate;methyl N-[[3-[[(2S)-4-amino-4-oxo-2-(quinoline-2-carbonylamino)butanoyl]amino]-2-oxo-4-phenylbutyl]-propan-2-ylamino]carbamate;methyl 3-[2-hydroxy-3-[[(2S)-3-methyl-2-(pyridin-2-ylmethoxycarbonylamino)butanoyl]amino]-4-phenylbutyl]-1,4,4a,5,6,7,8,8a-octahydrophthalazine-2-carboxylate;pyridin-2-ylmethyl N-[2-[[[3-[[(2S)-4-amino-4-oxo-2-(quinoline-2-carbonylamino)butanoyl]amino]-2-hydroxy-4-phenylbutyl]-propan-2-ylamino]carbamoyl]phenyl]carbamate