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Brainchild of Yunzhong Hou

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Cycloalkanes[]

Rule #1: Denote cyclo- with the cent sign.

Rule #2: Center symbols (the C and the cent signs so far) can only be omitted if either no atoms are being added (discussed later) or if it is a C and forms the first chain (before the first pipeline character).

4-ethyl-1-methylcyclodecane

The cyclo is denoted with the cent sign. Unlike the original C for straight chain hydrocarbons, this cannot be omitted.

Linked Strings[]

Rule #3: Linked carbon strings (branches of carbon attached to other branches at both ends) have C as the center symbol (unless it's not carbon), the superscript after it denoting number of atoms in the string, the subscript before it denoting the former atom # it is attached to, and the superscript before it denoting the latter atom # it is attached to.

Rule #4: When adding a linked carbon string, the added carbons are numbered in increasing numerical value from the former atom # (subscript) to the latter atom # (superscript).

UN01

Branches linked at both ends are given a subscript and a superscript referring to the connected atom #'s.

UN05

There is always one cyclo main. The others are linked onto what comes before them.

Aromatics[]

Rule #5: Benzene is represented by z and never has a superscript after it. The z cannot be omitted, even if it comes first in the name.

1,3-diethylbenzene

Benzene's central character is a z and cannot be omitted.

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