Thus, when the definition of a heterocyclic ring (e.g., in Rk) provides that when a ring sulfur is part of a non-aromatic ring and is attached to ring carbons, then any ring sulfur that is attached to ring carbons is a sulfoxide or a sulfone, it is understood that rings such as C and D are permitted (i.e., included in the definition of the ring), but rings such as E and F are not: [0198] The term