Dipeptides and amino acids of the formula A-E-G are disclosed wherein A is e.g. hydrogen or a- RbCO or RbSO2- where Ra and Rb are e.g. alkyl cycloalkyl or aryl;whereinR' is e.g. alkyl;n is 0 1;R2 is e.g. hydrogen or alkyl;R3 is OH NH2are e.g. alkyl;R4 is e.g. hydrogen or alkylR6 is H or methyl;R7 is e.g. hydrogen or alkyl;R8 is e.g. hydrogen methyl or cycloalkyl such that when R8 is cycloalkyl R6 and R7 are hydrogen;R9 is e.g. hydroxy.The compounds have enzyme inhibitor activity e.g. renin inhib...