| http://www.w3.org/ns/prov#value | - nteger 1 to 4 with the proviso that when n is 2 or more, a plurality of groups R1 may be the same or different, R2 is hydrogen, an alkyl group, an aryl group or an aralkyl group, and R3 is an alkyl group or an aryl group, or a group represented by the general formula:FORMULAwherein, X, R1 and n are as defined above, and substituted amines represented by the following general formula:FORMULAwherein
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