H4E1T1E1R1O1A1T1O1M3S1
16 points
HETEROATOMS is validvalid
HETEROATOM, [n]
HETEROATOM, an atom other than carbon in the ring of a heterocyclic compound [n]
HETEROATOM, [n]
HETEROATOM, an atom other than carbon in the ring of a heterocyclic compound [n]