Compounds of formula I ##STR1## wherein R, R.sub.1, R.sub.2 and q are as defined in the description, have valuable pharmacological properties and are especially effective as calcium metabolism regulators. They are prepared in a manner known per se.
式I的化合物:##STR1## 其中R、R.sub.1、R.sub.2和q的定义如描述中所述,具有有价值的药理学特性,特别是作为
钙代谢调节剂非常有效。它们的制备方法已知。