  We present a quantu spin liquid state in a spin-1/2 honeycomb lattice with
randomness in the exchange interaction. That is, we successfully introduce
randomness into the organic radial-based complex and realize a random-singlet
(RS) state. All magnetic and thermodynamic experimental results indicate the
liquid-like behaviors, which are consistent with those expected in the RS
state. These results demonstrate that the randomness or inhomogeneity in the
actual systems stabilize the RS state and yield liquid-like behavior.
