Dear Justin, Thanks for your quick answer.
I want to know about 704, 705 in following line: Double sids (704, 705) for atom 2525 Double sids (704, 705) for atom 2526 Double sids (704, 705) for atom 2527 Double sids (704, 705) for atom 2528 Double sids (704, 705) for atom 2529 Double sids (704, 705) for atom 2530 Double sids (704, 705) for atom 2531 Is this problem related to itp file obtained from antechamber? Please guide me how to resolve this problem? Best, Andrew -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.