U (S)-4-(6-((1-carboxy-2-(3-(methylsulfonyl)phenyl)ethyl)carbamoyl)-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-2-carboxylic acid, (S)-4-(6-((1-carboxy-2-(3-(methylsulfonyl)phenyl)ethyl)carbamoyl)-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-2-carboxylic acid