| abstract |
The present invention provides a compound capable of acting as an opioid receptor ligand for use as an analgesic, and a method for using and producing the same. A compound represented by formula (VI-1). [R 21 and R 22 are each independently H or CH 3 ; A 4 is a substituted / unsubstituted ring of the formula C (CH 2 ) n [where n = 2 to 5]; B 3 is H or substituted / Unsubstituted alkyl; B 4 is C 1 -C 6 alkyl; D 1 is substituted / unsubstituted aryl; B 5 is substituted / unsubstituted aryl] [Selection figure] None |