... Drawings generated by the command \tetrahedral The macros \rtrigonal and \ltrigonal are used to draw right-handed and left-handed trigonal units, respectively. For instance, the commands below output ... compare the representations produced by OCLAS (using Xymtec) and by the Anstein-Kremer's system (using Smile strings). Figure 23 shows the picture produced by the latter to represent the compound ... locants 4, 3, 2 and 1, the radicals methyl and ethyl, the carbon chain pent and the insaturation indicator ene. Further, guided by the constraints established by the main chain and lowest numbers...