[gmx-users] seek for forcefield parameters

[Jinyao Wang]

hi,gmx-users,
 I would like to study hydrogen bond in acetaldehyde system with Opls-AA force-field. But I found that the charge of hydrogen connecting to carbonyl group in acetaldehyde is 0 in the Opls-AA force-field.So it is not fit for me. 
It will be appreciated if anybody can supply forcefield parameters of the acetaldehyde or some suggestion for me.
	

　　　　　　　　
 				

　　　　　　　　Jinyao Wang
　　　　　　　　wangjy at ciac.jl.cn
　　　　　　　　　　2008-11-02