Ring File Number

Compound Ring system Name and ring file number... 

Hill System order and include the Ring File number. The RSH is issued once every five years, with cumulative supplements issued every six months. 

This group of compounds covers N-bridgehead oxazino-oxazines, thiazino-oxazines, and thia-zino-thiazines, and also their benzo-fused derivatives. Of the theoretically possible 10 oxazino-oxazines, three have ring file numbers, but no reference has been found for [l,4]oxazino[4,3-c][l,3]oxazines. The number of known benzo-fused systems is four. Of the theoretically possible 16 thiazino-oxazines, three are known and one benzo-fused system. Finally, of the 10 theoretically possible thiazino-thiazines two are known and one benzo-fused system (see Table 7). None of the groups of compounds was considered in CHEC-I, nor in previous reviews, therefore the whole of the literature has been surveyed. 

With the aid of the Ring File Number RF 9225, the structural formula can be found in the Ring Systems File. 

The Ring Name Index is an alphabetical list of the systematic names of all ring systems, e.g. Benzo[4,5]indeno[l,2-c]pyrrole [RF 40064]. The Ring File Number allows access to the Ring Systems File. 

All the systematic CA Index Names - with references to the corresponding Ring File Numbers - are listed alphabetically in the Ring Name Index (Fig. 75). In this case, as they are only the names of parent compounds, inversion of the CA Index Names is impossible. 

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