New thiophene compounds, processes for their preparation and pharmaceutical compositions containing them

摘要

Thiophene derivs. of formula (I) and their base addn. salts are new. X1, X2, Y1, Y2 = H, halo, 1-5C alkyl, 1-5C alkoxy or CF3; R1 = H or 1-5C alkyl; A = 1-5C hydrocarbon chain where each atom is opt. mono- or di-substd. by 1-5C alkyl; and R2 = H, 1-5C alkyl, cyclohexyl or benzyl.