A metal-organic framework Zn(NDC)(4,4'-Bpe)(0.5)center dot xG [NDC = 2,6-naphthalenedicarboxylate; 4,4'-Bpe = 4,4'-trans-bis(4-pyridyl)ethylene; G = guest molecules] has been synthesized, structurally characterized, and rationalized to be a two-interpenetrated elongated primitive cubic net. Powder X-ray diffraction and adsorption studies reveal the dynamic feature of the framework, which can take up hydrogen of about 2.0 wt% at 77 K and 40 bar and 0.3 wt% at 298 K and 65 bar.