| http://www.w3.org/ns/prov#value | - 1) R1 is a group represented by the formula: ???Y1???Y2???Y3???Ra wherein Y1, Y2, Y3, Ra and Rb are as defined in (1); 2) R1 is hydrogen, cyano, formyl, carboxy, isothiocyanato, amino, hydroxy, carbamoyl, or a group represented by the formula: ???Y1???Y2???Y3???Ra wherein Y1 and Y3 each is independently single bond or optionally substituted alkylene (the substituent is halogen, alkenylene, hydroxy
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