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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 






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