Its pKa values are estimated to be 1.3 and 6.5 for the two successive phosphate OH groups and 10.4 for the dimethylamine nitrogen , so in general it exists as a zwitterionic structure .
PRON NOUN NOUN AUX VERB PART VERB NUM CCONJ NUM ADP DET NUM ADJ NOUN PROPN NOUN CCONJ NUM ADP DET NOUN NOUN , CCONJ ADP ADJ PRON VERB ADP DET ADJ NOUN .