We have reported the crystal structure of the superconducting systems Y
2C
3 and Li
2Pd
3B without inversion symmetry. The structure of Y
2C
3 has the dumbbell-like C-C unit occupying polyhedrally-coordinated void, while the structure of Li
2Pd
3B has three-dimensional framework of the BPd
6 octahedron, which exists at the clearance gap of the Li partial structure. The superconducting transition temperature is strongly dependent on the structural change of the C-C distance in the Y
2C
3 system and of the distortion of the BPd
6 octahedron in the Li
2Pd
3B system.
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