( ( Since ( ( every ( organic molecule ) ) ( contains ( carbon ( ( -LRB- ( and ( usually ( hydrogen -RRB- ) ) ) ) atoms ) ) ) ) ) ( , ( ( ( the names ) ( of ( these ( to elements ) ) ) ) ( ( ( do not ) ( appear ( in ( ( the name ) ( of ( the compound ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Since) (S (NP (DT every) (JJ organic) (NN molecule)) (VP (VBZ contains) (NP (JJ carbon) (PRN (-LRB- -LRB-) (CC and) (ADVP (RB usually)) (NP (NN hydrogen)) (-RRB- -RRB-)) (NNS atoms))))) (, ,) (NP (NP (DT the) (NNS names)) (PP (IN of) (NP (NP (DT these)) (PP (TO to) (NP (NNS elements)))))) (VP (VBP do) (RB not) (VP (VB appear) (PP (IN in) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (DT the) (NN compound))))))) (. .)))
Since every organic molecule contains carbon (and usually hydrogen) atoms, the names of these to elements do not appear in the name of the compound.
(ROOT (S (NP (DT The) (NN element) (NN carbon)) (VP (VBZ is) (ADJP (JJ present) (PP (IN in) (NP (DT all) (JJ organic) (NNS molecules))))) (. .)))
The element carbon is present in all organic molecules.