prov:value
| - At least one of the substituent(s) represented by Y is a halogen, e.g. chlorine, bromine, iodine, or fluorine, and any other substituents can be (1) ether groups of the general formula --OR', wherein R' is a monovalent hydrocarbon radical similar to X, (2) monovalent hydrocarbon groups of the type represented by R, or (3) other substituents, e.g. nitro, cyano, hydroxy, etc., said substituents bein
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