prov:value
| - Amoung the derivatizing groups Y which may be employed, are, for example, a halogen such as fluorine, chlorine, bromine or iodine; an acyl halide group ##STR2## where X is fluorine, chlorine, bromine or iodine, a carboxylic acid, a hydride group such as ##STR3## where R is hydrogen, alkyl or aryl; an azide group (--N3), an epoxide group ##STR4## where R1, R2, R3 may be hydrogen or an alkyl moiety,
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