A compound with molecular formula C6H15N exhibits a singlet at d 0.9 (1H) ,a triplet at d 1.10 (3H) ,a singlet at d1.15 (9H) ,and a quartet at d 2.6 (2H) in its 1HNMR spectrum.Its IR spectrum shows one medium absorption band near 3400 cm-1.What is the structure of this compound? 
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