prov:value
| - In the above formula alkyl has, preferably, 1 to 4 carbon atoms (i.e. methyl, ethyl, propyl, butyl) arakyl has, preferably, not more than 8 carbon atoms and is preferably, benzyl and phenethyl and aryl is phenyl, the aryl or aralkyl being optionally substituted with halogen such as chloro, bromo, iodo and fiuoro, preferably metaor para-substituted or lower alkoxy-substituted (i.e. methoxy, ethoxy,
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