the exposed group had significantly higher mean levels of primary heptachlor metabolites -- ie , heptachlor epoxide ( 0.84 +/- 1.0 vs 0.50 +/- 0.9 parts per billion ) and oxychlordane ( 0.71 +/- 0.8 vs 0.49 +/- 1.1 parts per billion ) -- than the unexposed group .
C0019219
heptachlor
C0019220
heptachlor epoxide