| http://www.w3.org/ns/prov#value | - This Example illustrates the preparation, by the reaction KL shown shown in FIG. 2, of the aminosquaric acid derivative L in which R1 is a hydrogen atom, and R3 and R4 are each an ethyl group, this derivative being the derivative of Formula II in which Q1 is a 2-(1,1-dimethylethyl)-7-diethylaminobenz b!-4H-pyran-4-ylidene grouping, R1 is a hydrogen atom, and R3 and R4 are each an ethyl group.
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