(S (S (BASENP (DT This)) (VP (VBZ is) (NP (NP (NP (BASENP (DT the) (ADJP (JJ first) (RB legally)) (NN binding) (NN demand)) (PP (IN on) (BASENP (NNP Iran)))) (SBAR (S (VP (TO to) (VP (VB halt) (BASENP (NN enrichment) (NN work))))))) (CONJP (COMMA ,) (CC and)) (NP (BASENP (DT the) (NN first)) (SBAR (S (VP (TO to) (VP (VB suggest) (BASENP (JJ possible) (NNS sanctions)))))))))) (PERIOD .))