source leaprc.ff99SB
source leaprc.gaff
addAtomTypes {{ "ZN" "Zn""sp3" }}
lib = loadoff ZNA.lib.bk
frcmod = loadamberParams madfrcmod.zna
pro = loadpdb MutChang.pdb
 bond pro.84.SG pro.203.Zn
 bond pro.146.SG pro.203.Zn
 bond pro.150.SG pro.203.Zn
 bond pro.87.ND1 pro.203.Zn
set pro box {90.0000000 90.0000000 90.0000000}
saveamberparm pro MutChang.parm7 MutChang.crd
quit
