  We synthesized two C-S-H compounds from a mixture of carbon and sulfur in
hydrogen and from sulfur in mixed methane-hydrogen fluids at 4 GPa. X-ray
synchrotron single-crystal diffraction and Raman spectroscopy have been applied
to these samples up to 58 and 143 GPa, respectively. Both samples show a
similar Al2Cu type I4/mcm basic symmetry, while the hydrogen subsystem evolves
with pressure via variously ordered molecular and extended modifications. The
methane bearing sample lowers symmetry to an orthorhombic Pnma structure after
laser heating to 1400 K at 143 GPa. The results suggest that superconducting
C-S-H compounds are structurally different from a common Im-3m H3S.
