LAUSR

Computer-aided molecular design (CAMD) has attracted much attention in the past 30 years. The generation of a candidate molecular structure satisfying a set of structural constraints is an important part of such a problem. However, the commonly used structural constraints proposed by Odele and Macchietto [Odele, O.; Macchietto, S. Computer Aided Molecular Design: A Novel Method for Optimal Solvent Selection. Fluid Phase Equilib. 1993, 82, 47], cannot provide sufficient and necessary conditions for generating cyclic molecules. In this paper, the sufficient and necessary conditions for molecular generation were presented. According to these conditions, some modifications of the conventional constraints were made, and mathematical proofs demonstrated that the modified constraints can perfectly generate structurally feasible molecules with no more than two rings. Moreover, some new constraints were proposed to help generate feasible aromatic molecules with less than two rings. Finally, several cases were pres...