prov:value
| - uted with alkylamino,amino, hydroxy, alkoxy, alkoxycarbonyl, acyl, acyloxy, acylthio, mercapto, alkylthio, alkylsulfinyl or alkyl sulfonyl; each group, except hydrogen atom and alkyl, may be substituted or unsubstituted with alkyl; R.sup.a represents hydrogen atom or alkyl;X represents --COOR.sup.b, --CONH.sub.2, --CONR.sup.c -(Alk.sup.a).sub.r -R, --(CH.sub.2).sub.p --OC(.dbd.Y)--NR.sup.d --(Alk.
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