| http://www.w3.org/ns/prov#value | - A process according to claim 29, further comprising removing said protective group from the 3-oxo group and functionalizing ring A to form a ring of the formula ##STR49## wherein M and N together are a second bond or M is hydrogen and N ishydroxy,X is oxygen, two hydrogen atoms, or N.about.OH,R.sup.3 and D, being the same or different, are hydrogen, nitrile or C.sub.1 -C.sub.4 -alkyl, or together
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