1-(3,3-Dimethylamino)propyl naphtho(2,1-b)thiophene-4-carboxylate 113296-07-4 3-(Dimethylamino)propyl naphtho(2,1-b)thiophene-4-carboxylate Dap-natc Naphtho(2,1-b)thiophene-4-carboxylic acid, 3-(dimethylamino)propyl ester