| abstract |
PDE9 < / RTI > inhibitory action,n n n n n n n n Wherein,n n n R 1 and R 2 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an acyl group or an amino group,n n n R 3 represents an alkyl group, an aryl group, a saturated carbon cyclic group, a saturated heterocyclic group, an acyl group,n n n R 4 represents a hydrogen atom, a hydroxy group, an alkyl group or an amino group,n n n R 5 and R 8 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, a cyano group or a nitro group,n n n R 6 and R 7 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a cyano group, an amino group, a carbon ring group, a heterocyclic group, COR 9 or SO 2 R 9 ,n n n R 9 represents a hydrogen atom, a hydroxy group, an alkyl group, an amino group, a pyrrolidin-1-yl group, a piperidin-1-yl group, a piperazin-n n n X represents S or O,n n n A 1 , A 2 and A 3 each independently represent N or C,n n n A quinoxaline derivative or a salt thereof. |