thanks for reply.I want to perform simulation of popc membrane.
  Steps which i have done are as follows:
  1. download popc128a.pdb, popc.it,lipids.itp
  (http://moose.bio.ucalgary.ca/index.php?page=Structures_and_Topologies)
  2. download ffgmx_lipids files
  3.convert POPC of .top & popc.itp into POP as in popc.gro
  4. #include "ffgmx.itp" 
  #include "lipid.itp"
  #include "popc.itp"
  #include "ffgmxnb.itp"
  #include "ffgmxbon.itp"
  ................ in my .top file.
   
  Now when I perform
  pdb2gmx -ff gmx -f popc128a.pdb -o popc.gro -p popc.top
  it shows the error that"Residue 'POP' not found in residue topology database".
  I think that's because of the fact that ffgmx.rtp do not 
  contain "POP" residue ,but it has DPPC residue. 
  Plz suggest how can i solve this problem.
  thanks.

       
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