( ( ( ( Atomic Mass ) , ) ( ( ( Formula Mass ) and ) ( Molecular Mass. ) ) ) . )
(ROOT (NP (NP (NNP Atomic) (NNP Mass)) (, ,) (NP (NP (NNP Formula) (NNP Mass)) (CC and) (NP (NNP Molecular) (NNP Mass.))) (. .)))
Atomic Mass, Formula Mass and Molecular Mass.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT the) (NNS masses)) (PP (IN of) (NP (NP (DT the) (NNS atoms)) (PP (IN in) (NP (DT the) (NN formula)))))))) (VP (VBZ is) (VP (VBN referred) (PP (TO to) (NP (RB as) (JJ molecular) (NN mass))))) (. .)))