Chiral carbon atoms

There have been several older posts on the way that chiral centers are computed, whether N, P etc should be included.

e.g. CCOP(=O)(O)OC is reported as having 1 chiral center.

Is it possible to write a chemical terms expression to return just carbon atom based chiral centers?

I can use the evaluate command-line to get

carbon = filter("atno()==6");

cc = chiralCenters();

but I can't seem to do the join.

chiralCenters() does not take an atom index array, unlike charge().

Thanks

Stephen

Yes, it can be done. CT expression:

filter("chiralCenter() and atno()==6") 

Examples:

1. Return indexes of chiral carbon atoms only:

$ evaluate -e 'filter("chiralCenter() and atno()==6")' "CCC(Br)CC(Cl)CCOP(O)(=O)OC"
2;5

2. Return indexes of all chiral atoms:

$ evaluate -e 'filter("chiralCenter()")' "CCC(Br)CC(Cl)CCOP(O)(=O)OC"
2;5;10

3. Count chiral carbon atoms:

$ evaluate -e 'count(filter("chiralCenter() && atno()==6"))' "CCC(Br)CC(Cl)CCOP(O)(=O)OC"
2

Zsolt