Searching Reactions:

• New "grouping" operator, top-level parentheses are used to group dot-separated components.

• Solves the problem of inter- versus intra-molecular reaction queries.

Examples:

• C[C:2](=[O:1])[OH].[OH:3]C>>C[C:2](=[O:1])[O:3]C

  Matches any esterification reaction.

• (C[C:2](=[O:1])[OH].[OH:3]C)>>C[C:2](=[O:1])[O:3]C

  Matches any intra-molecular esterification reaction.

• (C[C:2](=[O:1])[OH]).([OH:3]C)>>C[C:2](=[O:1])[O:3]C

  Matches any inter-molecular esterification reaction.

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