The present invention provides a compound of formula (1) and a pharmaceutical composition comprising the compound useful as a nerve regeneration promoter wherein R 1 -L- is R 1 -OC(O)-, or the like, R 1 is hydrogen atom, optionally-substituted C 1-6 alkyl group, optionally-substituted 3- to 8-membered cycloalkyl group, or the like, R 2 is hydrogen atom or the like, Ring A is formula (2) or formula (3) wherein R 3 is hydrogen atom, optionally-substituted C 1-6 alkyl group, or the like, the part of X, Y, and Z is X=Y-Z, X-Y=Z, or X-Y-Z, X is nitrogen atom, NR 4 (R 4 is hydrogen atom, optionally-substituted C 1-6 alkyl group, or the like), or the like, Y is carbon atom or the like, and Z is carbon atom, nitrogen atom or the like.
