Abstract: A pyrimidine or triazine derivative and its salt, said pyrimidine or triazine derivative having the formula: ##STR1## wherein R represents a group of the formula OR.sup.3 {wherein R.sup.3 represents a hydrogen atom, an alkyl group, etc.}, a group of the formula SR.sup.6 {wherein R.sup.6 represents a hydrogen atom, an alkyl group, etc.}, a group of the formula ##STR2## {wherein R.sup.7 and R.sup.8 represent a hydrogen atom, an alkyl group, etc.}, or an imidazolyl group:R.sup.1 represents a hydrogen atom, an alkyl group, etc.;R.sup.2 represents a hydroxyl group, an alkyl group, etc.;A and B represent an alkyl group, etc.;Y represents an oxygen atom, etc.; andZ represents a methine group or a nitrogen atom.

Abstract: A pyrimidine or triazine derivative and its salt, said pyrimidine or triazine derivative having the formula: ##STR1## wherein R represents a group of the formula OR.sub.3 {wherein R.sup.3 represents a hydrogen atom, an alkyl gorup, etc.}, a group of the formula SR.sup.6 {wherein R.sup.6 represents a hydrogen atom, an alkyl group, etc.}, a group of the formula ##STR2## {wherein R.sup.7 and R.sup.8 represent a hydrogen atom, an alkyl group, etc.}, or an imidazolyl group:R.sup.1 represents a hydrogen atom, an alkyl group, etc.;R.sup.2 represents a hydroxyl group, an alkyl group, etc.;A and B represent an alkyl group, etc.;Y represents an oxygen atom, etc.; andZ represents a methine group or a nitrogen atom.