3-[(6R)-6-[(4-chlorophenyl)sulfonylamino]-2-methyl-5,6,7,8-tetrahydronaphthalen-1-yl]propanoic acid 3-[(2R)-2-[(4-chlorophenyl)sulfonylamino]-6-methyl-tetralin-5-yl]propanoic acid 3-[(2R)-2-[(4-chlorophenyl)sulfonylamino]-6-methyl-5-tetralinyl]propanoic acid 3-[(2R)-2-[(4-chlorophenyl)sulfonylamino]-6-methyl-tetralin-5-yl]propionic acid