SEE ALSO LIGANDS.TXT

Ligands and non-standard residues reported in the molecule information tab:

getHetNam() in moltab.js

Count is done with e.g. 1ijw (should return 2)

print {[TRS] and hetero}.groupindex.all.count().length
(suggested by Alexander Rose)

2022-06: it worked through 14.32.49 but returns 1 in 14.32.58 and 59. Bug reported.
While awaiting bug fix in 14.32.60, Bob suggests this workaround:
print {[hem] and hetero}.groupindex.all.pivot.keys.length

This was failing in JSmol 14.3.7 with 1ijw consistently, reported to jmol-users Sept 20, 2014.