piclamilast [ 3-(cyclopentyloxy)-N-(3,5-dichloro-4-pyridyl)-4-methoxybenzamide,3-cyclopentyloxy-N-(3,5-dichloro-4-pyridyl)-4-methoxybenzamide,RP 73-401,RP 73401,RP-73-401,RP-73401 ] an antiasthmatic agent and phosphodiesterase 4 inhibitor; structure in first source