I just checked in an initial version of this matching behavior.

The current implementation uses this table for non dummy atoms:
| Molecule | Query   | Match |
| CCO      | CCO     | Yes   |
| CC[O-]   | CCO     | Yes   |
| CCO      | CC[O-]  | No    |
| CC[O-]   | CC[O-]  | Yes   |
| CC[O-]   | CC[OH]  | No    |
| CCOC     | CC[OH]  | No    |
| CCOC     | CCO     | Yes   |
| CCC      | CCC     | Yes   |
| CC[14C]  | CCC     | Yes   |
| CCC      | CC[14C] | No    |
| CC[14C]  | CC[14C] | Yes   |
| OCO      | C       | Yes   |
| OCO      | [CH]    | Yes   |
| OCO      | [CH2]   | Yes   |
| OCO      | [CH3]   | No    |
| O[CH2]O  | C       | Yes   |
| O[CH2]O  | [CH2]   | Yes   |

-greg

------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing 
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
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