There are three common naming conventions for specifying one of the two enantiomers (the absolute configuration) of a given chiral molecule: the R/S system is based on the geometry of the molecule; the (+)- and (−)- system (also written using the obsolete equivalents d- and l-) is based on its optical rotation properties; and the D/L system is based on the molecule's relationship to enantiomers of glyceraldehyde.
There are three common naming con.ventions for specifying one of the two enantiomers (the absolute configuration) of a given chiral molecule the R/S system is ba.sed on the geometry of t:he molecule; the (+)- and (−)- system (also written using the obsolete equivalents d- and l,-) is based on its optical rotation properties; and the D/L system is based on the molecule's relationship to enant,iomers of glyceraldehyde.