| 摘要 |
<p>Compounds represented by general formula (I) or salts thereof; and use of both in hair tonics and so on: wherein R?1 and R2¿ are each independently an optionally substituted C¿1?-C30 hydrocarbon group or an optionally substituted five- or six-membered heterocyclic group containing 1 to 4 heteroatoms selected from among oxygen, sulfur and nitrogen; R?3¿ is hydrogen, optionally substituted alkyl, acyl, alkoxycarbonyl, phenoxycarbonyl, or optionally substituted carbamoyl; a and b are each independently 0 or 1; and m is 1 or 2.</p> |
