Formulae alphanumeric

TABLE 1.14 Empirical Formula Index of Organic Compounds The alphanumeric designations are keyed to Table 1.15. 

The formulas themselves are ordered alphanumerically without exception that is, the formulas listed above follow each other in the sequence BHgN, Br2CsH, CBe203, C3H3AIO9, OgS2Ti. 

The index is augmented by successively permuted versions of all empirical formulas. As an example, C3H3AIO9 will appear as such and, at the appropriate positions in the alphanumeric sequence, as H3A109 C3, AIO/C3H3 and 09 C3H3A1. The asterisk identifies a permuted formula and allows the original formula to be reconstructed by shifting to the front the elements that follow the asterisk. 

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