[gmx-users] Atomtype P,SI not found from grompp

[Jennifer Vo]

Dear Experts,
I ran a grompp (gromos53a6 ff)
grompp -f em.mdp -c complex2_solvated.gro -p topol.top -o complex.tpr

and it generated the error
Atomtype P,SI not found

I checked the gromos53a6.ff/atomtypes.atp and see there are P, SI in the
list
   SI  28.08    ;     Silicon
   P  30.97380 ;     Phosphor

And there is no P, SI in my complex2_solvated.gro file! I really do
appreciate for any help.
Regards,
Jennifer