( ( Compounds ( having ( ( ( a ( methylol group ) ) ( -LRB- ( ( - CH2OH ) -RRB- ) ) ) ( bonded ( to ( atoms ( other ( than ( ( ( ( ( carbon , ) oxygen ) , ) or ) hydrogen ) ) ) ) ) ) ) ) ) ( ( are ( ( regarded ( for ( this subclass ) ) ) ( as ( being ( ( ( two compounds ) , ) ( ( one ( of which ) ) ( is formaldehyde ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Compounds)) (VP (VBG having) (NP (NP (DT a) (JJ methylol) (NN group)) (PRN (-LRB- -LRB-) (NP (NNP -) (NNP CH2OH)) (-RRB- -RRB-)) (ADJP (JJ bonded) (PP (TO to) (NP (NP (NNS atoms)) (PP (JJ other) (IN than) (NP (NP (NN carbon)) (, ,) (NP (NN oxygen)) (, ,) (CC or) (NP (NN hydrogen)))))))))) (VP (VBP are) (VP (VBN regarded) (PP (IN for) (NP (DT this) (NNS subclass))) (PP (IN as) (S (VP (VBG being) (NP (NP (CD two) (NNS compounds)) (, ,) (SBAR (WHNP (CD one) (WHPP (IN of) (WHNP (WDT which)))) (S (VP (VBZ is) (NP (NN formaldehyde))))))))))) (. .)))
Compounds having a methylol group (-CH2OH) bonded to atoms other than carbon, oxygen, or hydrogen are regarded for this subclass as being two compounds, one of which is formaldehyde.
(ROOT (S (NP (DT An) (NN ether)) (VP (VBZ is) (NP (NP (DT an) (JJ organic) (NN compound)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (NN hydrocarbon) (NNS groups)) (VP (VBP are) (VP (VBG bonded) (PP (TO to) (NP (DT the) (JJ same) (NN oxygen) (NN atom))))))))) (. .)))