`C_6H_5CH=CHC_6H_5``(+)C_6H_5CH(O^(t)BU)CH_2C_6H_5``(-)C_6H_5CH(O^(t)Bu)CH_2C_6H_5``(PM)C_6H_5CH(O^t Bu)CH_2C_6H_5`
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