| prov:value
| - 7, and q have the above meanings, is reacted with a compound of the formula III ##STR4## in which m, n, p, R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 have theabove meanings, and X is capable of forming a good leaving group, X thus standing for e.g. a halogen atoms, such as chlorine, bromine or iodine, or an alkyl- or arylsulphonyloxy group, but other leaving groups can be used as well, such
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