Disclosed are compounds having the following general formula: ##STR1## wherein n is an integer of 1 or 2; R.sup.1 is an amino group when n is 2, or an amino group or a hydroxyl group when n is 1; and R.sup.2 is a hydroxyl group when n is 1, or a hydroxyl group or a group of the formula ##STR2## when n is 2; and microbiological process for producing the same. The compounds are useful as precursors for raising the production rate of SF-1293 substance. Some of the compounds are also useful as intermediates for synthesis of 2-amino-4-(hydroxy)(methyl)phosphinoylbutyric acid and the SF-1293 substance.