Sequences are in order of ascending ring size and start with lowest alphabetical heteroatom. Number of occurrences in a structure is optional. Sequence represents the shortest path from the lowest alphabetical heteroatom. Number of occurrences in a structure is optional. Sizes of the Rings in a Ring System Use when you know the sizes of ALL of the small rings in a ring system .
Sizes are in ascending order.
Number of occurrences in a structure is optional. Size of the Smallest Rings Use when you know the sizes of SOME of the small rings in a ring system . Sizes may be specified using numeric operators. Number of occurrences in a ring system is optional. Number of occurrences in a structure is optional.