| 摘要 |
PCT No. PCT/JP97/02649 Sec. 371 Date Mar. 31, 1998 Sec. 102(e) Date Mar. 31, 1998 PCT Filed Jul. 30, 1997 PCT Pub. No. WO98/04558 PCT Pub. Date May 2, 1998An active oxygen scavenger comprising as an active ingredient a pterin derivative of the formula (I): wherein R1 and R2 are independently a hydrogen atom, an alkyl group of 1 to 4 carbon atoms, or an acyl group of the formula R3-CO-, R3 is an alkyl group of 1 to 4 carbon atoms, X is a formyl group or hydroxymethyl group, A is a group of the formula (Ia): and n is 0 or an integer of 1 or more, with the proviso that when X is a hydroxymethyl group, n is 0, or when n is an integer of 1 or more, each of R1 and R2 is a hydrogen atoms, and X is a formyl group, or a cyclic compound thereof, or a salt thereof is disclosed.
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