( ( Note ( that ( subscripts ( are ( used ( to ( designate ( ( the number ) ( of ( atoms ( of ( ( each element ) ( that ( are ( present ( in ( the molecule ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (NN Note) (SBAR (IN that) (S (NP (NNS subscripts)) (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB designate) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS atoms)) (PP (IN of) (NP (NP (DT each) (NN element)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ present) (PP (IN in) (NP (DT the) (NN molecule)))))))))))))))))))) (. .)))
Note that subscripts are used to designate the number of atoms of each element that are present in the molecule.
(ROOT (S (SBAR (IN If) (S (NP (NP (RB only) (CD one) (NN atom)) (PP (IN of) (NP (DT a) (JJ specific) (NN type)))) (VP (VBZ is) (ADJP (JJ present))))) (NP (DT a) (NN subscript)) (VP (VBZ is) (RB not) (VP (VBN used))) (. .)))