LipidBuilder automatically generates the topology and template of a given lipid. The lipid topology is created by combining the selected head group, extracted from a built-in library of structures and the provided hydrocarbon chains. Four different classes of hydrocarbons have been parametrized in the CHARMM force field: saturated, unsaturated, branched and cyclopropane.
ATTENTION concerning the starting carbon: for most head groups, the ester group is not included in the hydrocarbon tail, and for sphingolipids, the first two carbons.