On Thu, Mar 1, 2012 at 4:49 AM, JP <[email protected]> wrote:
>
> How are Hs handled ?  Are implicit and explicit Hs handled in the same way?
>
> E.g.
> Does molecule CCC (defined without Hs) match query [CH3][CH2][CH3] (or
> [CH3]) ?  (Do you take in consideration implicit Hs?)
> Does molecule [CH3][CH2][CH3] match query CCC ? (This should match as you
> can find CCC in the molecule).

Good point, more clarity is needed there. How about this as a proposal:

| OCO      | C       | Yes   |
| OCO      | [CH2]   | Yes   |
| OCO      | [CH3]   | No    |
| O[CH2]O  | C       | Yes   |
| O[CH2]O  | [CH2]   | Yes   |

Here's a less obvious one:
| OCO      | [CH]    | Yes   |

I would argue that this one is correct because "C[H]" is a
substructure of "OC([H])([H])O"

-greg

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