Propose a Structure for Compound Z,which Has the Following Spectroscopic

Propose a structure for Compound Z,which has the following spectroscopic properties:
MS:
M⁺ = 88
IR:
3380 cm−^1
1H NMR:
0.85 δ (6H doublet);1.40 δ (3H multiplet);2.68 δ (1H singlet);3.55 δ (2H triplet)
Broadband decoupled ¹³C NMR:
22.7,25.0,41.8,60.5 δ
DEPT-90:
25.0 δ
DEPT-135:
positive peaks at 22.7,25.0 δ;negative peaks at 41.8,60.5 δ