prov:value
| - The preferred triarylmethyl groups are represented by the formula: ##STR5## wherein each of R1, R2 and R3 is an aryl group such as phenyl, naphthyl, quinolyl, furyl, thienyl, or other nitrogen, sulfur and/or oxygen-containing heterocyclic ring; or such aryl groups with a monosubstituent such as halide (F, Cl, Br or I), nitro, lower alkoxy, lower alkyl, and aryl, aralkyl and cycloalkyl containing u
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