3SP2 topological descriptor would be good to have if the rest are not 
implemented :-)

Robert Stones <[EMAIL PROTECTED]> wrote:

> Are Topological CTYPES Available ?
>
> 1SP1 triply bound carbon bound to one other carbon 2SP1 triply bound
> carbon bound to two other carbons 1SP2 doubly hound carbon bound to one
> other carbon 2SP2 doubly bound carbon bound to two other carbons 3SP2
> doubly bound carbon bound to three other carbons 1SP3 singly bound
> carbon bound to one other carbon 2SP3 singly bound carbon bound to two
> other carbons 3SP3 singly bound carbon bound to three other carbons
> 4SP3 singly bound carbon bound to four other carbons Rajarshi Guha
> <[EMAIL PROTECTED]> wrote:
>
>>
>> On Sep 27, 2007, at 11:24 AM, Robert Stones wrote:
>>
>>> Great
>>>
>>> If you could get the last two implemented Topological DMCON MOLC-3
>>> and DMCHI (S)
>>> S7CH - would be tops.
>>
>> OK, S7CH is implemented (in ChiChainDescriptor and is called SCH-7)
>> along with the valence version of the descriptor. However, I think
>> it's going to be slow for larger molecules because it has to look for
>>  23 fragments.
>>
>> More generally, can anybody describe what a 7th order chain is?
>>
>> My understanding is that it must be 7 atoms, containing a ring. This
>> means it can be
>>
>> 1. 6-member ring with 1 branch - C1CCCCC1C
>> 2. 5 member ring with various branches - C1CCCC1(C)(C) or C1CCCC1CC etc
>> 3. 4-member ring with various branches ...
>> 4. 3 member ring with various branches ...
>>
>> I think I have all the possible cases of 4), but I might be wrong!
>>
>> I have a feeling that this is overly complex and I seem to have heard
>>  that Molconz-Z uses a simplified definition of n'th order chains.
>>
>> BTW, I think hydrogen addition is not working as the unit tests are
>> failing for the valence versions. So the values are probably wrong at
>>  the moment
>>
>> -------------------------------------------------------------------
>> Rajarshi Guha  <[EMAIL PROTECTED]>
>> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04  06F7 1BB9 E634 9B87 56EE
>> -------------------------------------------------------------------
>> 667:
>>      The neighbor of the beast.
>>
>>
>
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