Ionizable groups were introduced onto the 10,11-dihydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine scaffold of the vasopressin V2-antagonist WAY-VPA-985 in the search for molecules optimized for parenteral formulation. The synthesis and structure activity relationships (SAR) are presented together with solubility data in a model parenteral system. The amine, WAY-140288 (4f), was chosen for further development. p6
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