WHEREIN N IS AN INTEGER OF 1 TO 4; R1 and R2 represent an alkyl group having 1 to 4 carbon atoms or a phenyl group; R3 represents a hydrogen atom, an alkoxyl group wherein the alkyl group is an alkyl group having 1 to 4 carbon atoms, an alkoxycarbonyl group wherein the alkyl group is an alkyl group having 1 to 4 carbon atoms or a halogen atom.
A novel color forming material used in a pressure sensitive copying paper comprises