Supertetrahedral clusters are the most common building blocks in constructing Group 13/14/16 microporous metal chalcogenide materials while other types of clusters are yet scarcely explored. Herein, a new crown-like building unit [In₃Ge₃S₁₆] has been obtained. The units assemble into a 3D framework [C₆H₁₄NO]₄[In₆Ge₃S₁₇]·1.5H₂O (1) via a dual-connection mode and a SrSi₂ (srs)-type topology could be achieved by treating each unit as a tri-connected node.