The present invention provides a pharmaceutical composition for use as art NPY Y5 receptor antagonist comprising a compound or the formula (I):
wherein R
1
is lower alkyl, cycloalkyl or the like,
R
2
is hydrogen, lower alkyl or the like,
n is 1 or 2,
X is lower alkylene, lower alkenylene, arylene, cycloalkylene or the like,
Y is CONR
7
, CSNR
7
, NR
7
CO, NR
7
CS or the like,
Z is lower alkyl, optionally substituted carbocyclyl, optionally substituted heterocyclyl or the like and R
7
is hydrogen or lower alkyl,
prodrug, pharmaceutically acceptable salt or solvate thereof.
The present invention provides nucleic acid delivery polyplex complexes and anionic open polyplexes comprising a nucleic acid molecule reversibly bound to one or more of nucleic acid delivery polyplex complexes.