Benzopyrans of the formula ##STR1## wherein n represents 0 or 1, R is an alkyl group having 1 to 20 carbon atoms, an aryl-lower alkyl group or a cycloalkyl-lower alkyl group, R.sub.1 is hydrogen or ##STR2## wherein R.sub.4 is lower alkyl, phenyl, cycloalkyl-lower alkyl or aryl-lower alkyl, R.sub.2 is a lower alkyl and R.sub.3 is hydrogen or one or two lower alkyl groups, pharmaceutical compositions containing the compounds, and uses of the compounds as tranquilizers and analgesics.
                            公式为##STR1##的苯并
吡喃类化合物,其中n表示0或1,R是1至20个碳原子的烷基,芳基-低烷基或环烷基-低烷基,R.sub.1是氢或##STR2##其中R.sub.4是低烷基,苯基,环烷基-低烷基或芳基-低烷基,R.sub.2是低烷基,R.sub.3是氢或一或两个低烷基,含有该化合物的制药组合物,以及该化合物作为镇静剂和镇痛剂的用途。