source leaprc.ff99SB
source leaprc.gaff 
loadamberparams sustiva.frcmod 
loadoff sus.lib 
complex = loadpdb 1FKO_trunc_sus.pdb 
saveamberparm complex 1FKO_sus.prmtop 1FKO_sus.inpcrd
savepdb complex 1FKO_sus.pdb 

quit