Neurokinin antagonists

A compound of formula (I) ##STR16## wherein A is phenyl optionally substituted by one, two or three R.sup.4 ;

• B is --C(O)--CH.sub.2 -- or --C(O)--CH.sub.2 --CH.sub.2 --;
• Z is piperidinyl substituted by R.sup.8 ;
• R.sup.1 is H, C.sub.1-6 alkyl or phenyl;
• R.sup.2 is H, C.sub.1-6 alkyl optionally substituted by a phenyl group or --CO--C.sub.1-3 alkyl optionally substituted by a phenyl group,
• R.sup.3 is H, C.sub.1-6 alkyl, C.sub.1-6 alkyl substituted by one, two or three fluorine atoms, halogen or C.sub.1-6 alkoxy,
• m is 1, 2 or 3;
• each R.sup.4 is independently C.sub.1-6 alkyl, C.sub.1-6 alkyl substituted by one, two or three fluorine atoms, C.sub.1-6 alkoxy, C.sub.1-6 alkylthio or halogen, or two adjacent R.sup.4 groups denote --O--(CH.sub.2)--O-- or --(CH.sub.2).sub.3-5 --;
• R.sup.8 is hydrogen, C.sub.3-7 cycloalkyl, phenyl, ##STR17## C.sub.1-6 alkyl, allyl, --(CH.sub.2).sub.2-6 OH, --(C.sub.1-3)alkylphenyl, diphenylmethyl or --(C.sub.1-3)alkyl(C.sub.3-7)cycloalkyl, wherein the phenyl groups may be substituted by one or two substituents selected from methyl, F, Cl, OCH.sub.3, SCH.sub.3, CF.sub.3, OH or NO.sub.2, or substituted by --O--CH.sub.2 --O-- linking two adjacent carbon atoms of the phenyl;
• or R.sub.8 is --CH.sub.2 OH, --OH, ##STR18## wherein the last 6 groups mentioned are in position 3 or 4;
• R.sup.12 is H or methyl;
• and
• R.sup.14 is H, C.sub.1-6 alkyl, phenyl or cyclohexyl, wherein if two R.sup.14 s are present and one of the R.sup.14 s is phenyl or cyclohexyl, the other R.sup.14 must be H.