2-[[3-[4-[(3,4-dichlorophenyl)methoxy]phenyl]-7-(2,5-dimethyl-1,3-oxazole-4-carbonyl)-3,6,8,9-tetrahydro-2H-[1,4]dioxino[2,3-g]isoquinoline-8-carbonyl]amino]-3-[4-(2,3-dimethyl-4-pyridinyl)phenyl]propanoic acid