These employ boron, antimony, or halogenated hydrocarbon compounds. PHAs are soluble in halogenated solvents such chloroform, dichloromethane or dichloroethane. Cured furan resins are resistant to attack by strong acids, bases, and halogenated hydrocarbons. TCP Liquid's active ingredients are halogenated phenols and phenol. Halogenated acetic acids are produced from acetic acid. Halogenated hydantoin compounds are also used as biocides. The treaty is structured around several groups of halogenated hydrocarbons that deplete stratospheric ozone. Bleaching with hypochlorite generates halogenated compounds in side reactions; chloroform is the main byproduct. These reactions are an important industrial route to halogenated hydrocarbons. Among these were halogenated hydrocarbons often used in fire suppression. The first two halogenated ethers were methoxyflurane and enflurane. The bacteria "Nitrosomonas europaea" can degrade a variety of halogenated compounds including trichloroethylene. Many products containing halogenated flame retardants are sent to landfills. Many are well known for their production and accumulation of various halogenated phenols and pyrroles. Some occupations expose workers to higher levels of halogenated flame retardants and their degradation products.