Data Views Exclude Ubiquitous Chemicals Activities: 250 Chemicals w/Activities: 42 CSV Excel PDF All Chemicals: 100 Previous123 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Leaf Plant Low PPM High PPM StdDev *Reference 23 23 TERPINEN-4-OL Leaf -- 215.0 -0.22 * 17 17 THUJONE Leaf -- 16.0 -0.74 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.