passages.id: split_8_test_2882_passage
passages.type: progene_text
passages.text: The Gly-526 and Leu-384 mutants formed , in addition , three novel products identified by LC-MS , NMR , and circular dichroism as 8,9-11,12-diepoxy-13R-(or 15R ) - hydro ( pero ) xy derivatives of arachidonic acid .