MM3 model for water



 Dear CCLers,
 I'm tryng to calculate the interaction energy beetwen a water molecule and
 a very large molecule, in each point of SAS, with MM3 force field.
 In order to minimize calculation time I need to treat the water molecule
 as a single atom.
 Does anybody knowm some water parametrization that I can use with MM3 FF?
 thank'you
 --
 Mirco Meniconi
 PhD candidate
 dip. chimica e tecnologia del farmaco
 via del liceo 1 06100 Perugia
 university of Perugia (ITALY)
 phone: +39 075 585 5169
 phone: +39 075 585 5114
 e-mail: mirco.me' at \`inwind.it
 e-mail: mirco' at \`unipg.it
 Prima ti ignorano. Poi ridono di te.
 Poi ti combattono. Poi tu vinci.