Macrocycle Filter

Has anyone worked out a Pipeline PIlot custom filter that will properly identify macrocycles (molecules that

contain a ring of nine or more atoms)?  This is not quite as trivial as it might seem.  For example, a fused

6-6 ring system contains a "ring" consisting of 10 atoms, but is not considered a "macrocycle."

Regards,

Jim Metz

James.Metz@AbbVie.com