2-Oxa-4,8,13-triazatetradecan-14-oic acid,8-[(2S)-2-[[[(2R,3R)-3-(ethoxycarbonyl)oxiranyl]carbonyl]amino]-1-oxo-3-[4-(phenylmethoxy)phenyl]propyl]-3-oxo-1-phenyl-, phenylmethyl ester