Abstract: A compound having gastric acid secretion reducing activity and having the formula ##STR1## wherein each V and W, independently, is H, --CH.sub.2 COOR.sup.4 where R.sup.4 is H or lower alkyl, --CH.sub.2 CN, or ##STR2## or V and W together represent .dbd.CHCOOR.sup.4 or .dbd.CHCN; A is ##STR3## R.sup.1 is H or CH.sub.3 ; L is CH.sub.2 S; Q is O or CH.sub.2 S; n is 0 or 1; 2 m 4; each R.sup.2 and R.sup.3, independently, is hydrogen, lower alkyl, lower cycloalkyl, or lower aralkyl; or R.sup.2 and R.sup.3, together with the nitrogen atom to which they are attached, form a 4, 5, or 6 membered heterocyclic ring containing 0, 1, or 2 oxygen atoms and 1, 2, or 3 nitrogen atoms and being unsubstituted or lower alkyl substituted; and Ar is a single ring aromatic group selected from aryl, substituted aryl, fused aryl, or heteroaryl; or the pharmaceutically acceptable salt thereof.