I looked it up and found this Myclobutanil is a triazole chemical used as a fungicide. It is a steroid demethylation inhibitor, specifically inhibiting ergosterolbiosynthesis. Ergosterol is a critical component of fungal cell membranes. When heated myclobutanil decomposes to produce corrosive and/or toxic fumes, including carbon monoxide, carbon dioxide, hydrogen chloride, hydrogen cyanide, and nitrogen oxides. Myclobutanil is banned in Canada, Colorado, Washington, and Oregon for the production of marijuana; The Promis contains Myclobutanil.