1 6OY Ethyl (4r)-4-[[(2s,4s)-1-[(2s)-3-methyl-2-[(5-methyl-1,2-oxazol-3-yl)carbonylamino]butanoyl]-4-phenyl-pyrrolidin-2-yl]carbonylamino]-5-[(3s)-2-oxidanylidenepyrrolidin-3-yl]pentanoate 1.000 2 HOV Ethyl (4r)-4-[[(2s,3r)-1-[(2s)-3-methyl-2-[(5-methyl-1,2-oxazol-3-yl)carbonylamino]butanoyl]-3-phenyl-pyrrolidin-2-yl]carbonylamino]-5-[(3s)-2-oxidanylidenepyrrolidin-3-yl]pentanoate 0.872