I Lab Services 

4.12.1.3  Forward Locants Position 

This allows you to specify the position of locants: either before the whole name or immediately 

before the corresponding part of the name.  For example: 

O

OH

H C

3

HO

O

CH

2

O

OH

Yes 

1 propene 1,1,5 pentanetricarboxylic 

acid 

No 

prop 1 ene pentane 1,1,5 tricarboxylic acid 

4.12.2 Old/New Tab 

4.12.2.1  Hantzsch Widman New Stems 

This permits you to specify the usage of the extended Hantzsch Widman system stems based on 

either Recommendation 1982 (Pure Appl. Chem.1983, 55, 409 416) or Nomenclature of 

Organic Chemistry, 1979 ed. (Blue book).  For example: 

As

P

OH

Yes 

phosphinine arsinin 2 ol 

No 

phosphorin arsenin 2 ol 

4.12.2.2  Extended Fused List 

Specifies whether to use the additional trivial or semi systematic retained names according to A 

Guide to Nomenclature of Organic Compounds (Recommendations 1993) or to use the 

more limited list based on Nomenclature of Organic Chemistry, 1979 ed. (Blue book).  For 

example: 

Yes 

hexahelicene 

No 

benzo[c]naphtho[1,2 g]phenanthrene 

ACD/I Lab via ChemSketch  

User's Guide 

35