Birch, Stewart, Kolasch and Birch
Process for preparing (+)-homopilopic acid
 A process for preparing (+)-homopilopic acid and the salts thereof which comprises hydrolyzing a mixture of (+)-homopilopic acid ester of the general formula (I): ##STR1## wherein R.sub.1 denotes straight or branched C.sub.1 -C.sub.10 hydrocarbon, and (-)-homopilopic acid ester of the general formula (II): ##STR2## wherein R.sub.2 denotes straight or branched C.sub.1 -C.sub.10 hydrocarbon, in the presence of a microorganism belonging to the genus Arthrobacter, Aspergillus, Escherichia, Cunninghamella, Xanthomonas, Candida, Pseudomonas, Serratia, Cellulomonas, Nocardia, Bacillus, Brevibacterium, Flavobacterium, Mycobacterium, Rhizomucor, Rhodotorula or Rhodococcus, or a treated matter thereof. 
Mitsui Petrochemical Industries, Ltd.
C C Y Y Y Y
C12P C12P Y10S Y10S Y10S Y10S
inventional inventional additional additional additional additional
Mikio Junzou Shoichi Aiichiro Hideaki
Hayashida Hiratsuka Kise Ori Yamada