Chemical compounds of the formula ##STR1## wherein B, R.sup.1, R.sup.2, R.sup.3, R.sup.7, R.sup.8, m and n are as defined hereinbelow, which compounds are intermediates for the preparation of antiemetic agents.
化学式为##STR1##的化合物,其中B、R.sup.1、R.sup.2、R.sup.3、R.sup.7、R.sup.8、m和n的定义如下,这些化合物是制备抗恶心药物的中间体。