( ( ( ( Cyclic ethers ) ( which ( have ( ( 3 atoms ) ( forming ( a ring ) ) ) ) ) ) ( -LRB- ( ( ( ( one ( oxygen atom ) ) , ) ( two ( carbon atoms ) ) ) -RRB- ) ) ) ( ( are ( called ( ( epoxides or ) oxiranes ) ) ) . ) )
(ROOT (S (NP (NP (NP (JJ Cyclic) (NNS ethers)) (SBAR (WHNP (WDT which)) (S (VP (VBP have) (NP (NP (CD 3) (NNS atoms)) (VP (VBG forming) (NP (DT a) (NN ring)))))))) (PRN (-LRB- -LRB-) (NP (NP (CD one) (NN oxygen) (NN atom)) (, ,) (NP (CD two) (NN carbon) (NNS atoms))) (-RRB- -RRB-))) (VP (VBP are) (VP (VBN called) (NP (NNS epoxides) (CC or) (NNS oxiranes)))) (. .)))
Cyclic ethers which have 3 atoms forming a ring (one oxygen atom, two carbon atoms) are called epoxides or oxiranes .
(ROOT (S (NP (NNS Ethers)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NP (DT an) (NN oxygen) (NN atom)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (NP (JJ single) (NNS bonds)) (PP (IN with) (NP (CD two) (NN carbon) (NNS atoms)))))))))) (. .)))