2E, 4E-Hexadienoic Acid Isobutylamide (25 mg),
https://www.europathol.org/shop/rw2-1305507-2e-4e-hexadienoic-acid-isobutylamide-25-mg-302457
https://www.europathol.org/web/image/product.template/302457/image_1920?unique=813f639
This 2E, is guaranteed a 4E-Hexadienoic with the use of Acid Isobutylamide and directly supplied to your lab by Gentaur's warehouse.
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