Vasopressin receptor agonists V1a

A compound having the formula (I): ** ** Formula wherein: R1 is selected from H and part of a structure of cyclobutyl; R2 is selected from (CH2) mX and part of said structure cyclobutyl; m is selected from 0, 1, 2 and 3; n is selected from 0, 1, 2, 3 and 4; p is selected from 2, 3 and 4; when R1 is H, R2 is (CH2) mX, when R1 is not H, R1 and R2 together with the carbon atom - to which they are attached form said structure cyclobutyl: when m is 0, 2 or 3, X is selected cyclopentyl or cyclohexyl; when m is 1, X is selected from cyclopentyl, cyclohexyl, isopropyl and tert-butyl; said structure cyclobutyl, cyclopentyl and cyclohexyl optionally have at least one alkyl substituent, O-alkyl or hydroxyl; R3, R4, R5, R6, R7 and R8 each independently selected from H, I, alkyl, OH, O-alkyl and OC (O) -; alkyl is selected from linear C1-6 alkyl or branched chain C4-8 and optionally having at least one hydroxyl substituent; and solvates and pharmaceutically acceptable salts thereof.