1 2 4 trichlorobenzene point group July 8, 2019 16 32 64 128 1 2 4-trichlorobenzene 1 2 3-trichlorobenzene point group 1 2 4 5-tetrachlorobenzene point group 1 2 4-trichlorobenzene cas number 1 2 3-trichlorobenzene