| http://www.w3.org/ns/prov#value | - The aromatic vinyl compound may be represented by the following formula ##STR2## wherein R1 represents a hydrogen atom, a lower (C4 or less) alkyl group or a halogen atom, R2 represents a substituent such as a lower alkyl group or a halogen atom, and n is an integer of not more than 2 including zero.
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