Symmetry considerations in Markovian chemicals 'in silico' design (MARCH-INSIDE) I: central chirality codification, classification of ACE inhibitors and prediction of sigma-receptor antagonist activities. - Humberto González Díaz; Ivan Hernández Sánchez; Eugenio Uriarte; Lourdes Santana (Comput. Biol. Chem., 2003)