2-(((3,8-Dimethyl-5-(1-methylethyl)-1-azulenyl)amino)carbonyl)butanoic acid 4-(N-(3-Quaiazulenyl)carbamoyl)butyric acid 80857-44-9 Butanoic acid, 2-(((3,8-dimethyl-5-(1-methylethyl)-1-azulenyl)amino)carbonyl)-