Abstract: The improved hybrid calcitonin has a peptide segment in human calcitonin and a peptide segment in calcitonin derived from animals other than humans, such as eel, salmon and chicken. Each of the human or human analog calcitonins and the calcitonins derived from animals other than humans may be either native calcitonin or an analog thereof. The hybrid calcitonin has the outstanding advantage that it exhibits biological activities as strong as eel, salmon and chicken calcitonin while causing no side effects including nausea, disorders in the functions of the digestive tract or antigenicity.

Abstract: Novel benzhydrylamine derivatives represented by general formulas (I) and (II) are useful as reaction reagents for the solid-phase synthesis of polypeptide amides making use of 9-fluorenylmethyloxycarbonyl group ("Fmoc"). An intermediate for these derivatives represented by the general formula (III) is also disclosed: ##STR1## where R.sub.1 and R.sub.2 each independently represents a C.sub.1-3 lower alkyl; n is an integer of 1-4; l is 1 or 2; and m is 1 or 2.

Abstract: Novel benzhydrylamine derivatives represented by general formulas (I) and (II) are useful as reaction reagents for the solid-phase synthesis of polypeptide amides making use of 9-fluorenylmethyloxycarbonyl group ("Fmoc"). An intermediate for these derivatives represented by the general formula (III) is also disclosed: ##STR1## where R.sub.1 and R.sub.2 each independently represents a C.sub.1 -C.sub.3 lower alkyl; n is an integer of 1-4; l is 1 or 2; and m is 1 or 2.

Abstract: Vitamin D derivatives of the formula ##STR1## where R.sub.1, R.sub.2 and R.sub.3 which may be the same or different each represents a hydrogen atom or a hydroxyl group; X is an oxygen atom, the group of the formula OR.sub.4 (where R.sub.4 is either a hydrogen atom or a lower alkyl having 4 to 6 carbon atoms that may or may not be substituted by a hydroxyl group), or the group of the formula=N-OR.sub.5 (where R.sub.5 is either a hydrogen atom or a lower alkyl group having 1 to 5 carbon atoms that may or may not be substituted by a hydroxyl group, an amino group or a lower alkylamino group having 1 to 3 carbon atoms), provided that the carbon atom at 20-position is linked to X by a single bond when X is the group of the formula OR.sub.4, and by a double bond in other cases, and a process for preparing the derivatives are disclosed.

Abstract: A 1.alpha.-hydroxy vitamin D.sub.3 derivative of the formula: ##STR1## where R.sub.1 is a hydroxyl group, an amino group or the group: OR' (where R' is a lower alkyl group having 1 to 7 carbon atoms that may or may not be substituted by a hydroxyl group, a halogen atom, a cyano group, a lower alkoxy group having 1 to 3 carbon atoms, an amino group, or an acylamino group); R.sub.2 is a hydrogen atom or a hydroxyl group), and a process for preparing the same are disclosed.The compound represented by the formula above has the calcium control action and the ability to induce differentiation in tumor cells and, therefore, are useful as an antitumor agents and a medicine for treating calcium dysbolism-caused diseases.