5 methoxy 2 methyl 1h inden 1 one therein described an equimolar quantity of 6 7 dichloro 2 cyclopentyl 2 3 dihydro 5 methoxy 2 pentyl 1h inden 1 one there is obtained 6 7 dichloro 2 cyclopentyl 2 3 dihydro 5 hydroxy 2 pentyl 1h inden 1 one which is used in step c without further purification by following substantially the procedure described in example 2 step c but substituting for the 6 7 dichloro 2 cyclopentyl 2 ethyl 2 3 dihydro 5 hydroxy 1h inden 1 one an equimolar quantity of 6 7 dichloro 2 cyclopentyl 2 3 dihydro 5 hydroxy 2 pentyl 1h inden 1 one therein described there is obtained 4 6 7 dichloro 2 cyclopentyl 2 3 dihydro 1 oxo 2 pentyl 1h inden 5 yl oxy butanoic acid by following substantially the procedure described in example 2 step a but substituting for the ethyl iodide therein described an equimolar quantity of hexyl iodide there is obtained 6 7 dichloro 2 cyclopentyl 2 hexyl 2 3 dihydro 5 methoxy 1h inden 1 one by following substantially the procedure described in example 2 step b but substituting for the 6 7 dichloro 2 cyclopentyl 2 ethyl 2 3 dihydro 5 methoxy 1h inden 1 one therein described an equimolar quantity of 6 7 dichloro 2 cyclopentyl 2 hexyl 2 3 dihydro 5 methoxy 1h inden 1 one there is obtained 6 7 dichloro 2 cyclopentyl 2 hexyl 2 3 dihydro 5 hydroxy 1h inden 1 one which is used in step c without further purification by following substantially the procedure described in example 2 step c but substituting for the 6 7 dichloro 2 cyclopentyl 2 ethyl 2.