Agent: 20110152262 - Novel compounds: wherein R1 is 2-indanyl, R2 is 1-methylpropyl, R3 is a group selected from 2,6-dimethyl-3-pyridyl or 4,6-dimethyl-3-pyridyl, R4 represents methyl and R5 represents hydrogen or methyl or, R4 and R5 together with the nitrogen atom to which they are attached represent morpholino and pharmaceutically acceptable derivatives thereof are described, as are...