( Biotin ( ( is ( ( a ( heterocyclic compound ) ) ( that ( contains ( ( an ( imidazolidone ring ) ) ( joined ( to ( a ( tetrahydrothiophene ring ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Biotin)) (VP (VBZ is) (NP (NP (DT a) (JJ heterocyclic) (NN compound)) (SBAR (WHNP (WDT that)) (S (VP (VBZ contains) (NP (NP (DT an) (JJ imidazolidone) (NN ring)) (VP (VBN joined) (PP (TO to) (NP (DT a) (JJ tetrahydrothiophene) (NN ring)))))))))) (. .)))
Biotin is a heterocyclic compound that contains an imidazolidone ring joined to a tetrahydrothiophene ring.
(ROOT (S (NP (DT A) (JJ heterocyclic) (NN compound)) (VP (VBZ contains) (NP (NP (NNS atoms)) (PP (IN of) (NP (NP (QP (CD two) (CC or) (JJR more)) (JJ different) (NNS elements)) (PP (IN in) (NP (PRP$ its) (NN ring) (NN structure))))))) (. .)))