The original patent on omeprazole, the active chemical in Prilosec, ran out on Oct. 5.

FORBES: Magazine Article

In addition to selling the once-a-week Prozac, Lilly has also re-branded fluoxetine, the active chemical in Prozac, to treat a serious form of premenstrual syndrome.

FORBES: Lilly Gives Away Prozac, Makes Money

The patent protecting the active chemical in the drug has already expired, but a second patent, on using that chemical as a muscle relaxant, is valid until December 2021.

FORBES: Magazine Article

The hope is that by telling buyers which herbs are valuable for what, which characteristics to seek when making a purchase, and which chemical tests identify active ingredients, the new pharmacopoeia will provide that boost.

ECONOMIST: A pharmacopoeia for Africa

One trade group -- the Chemical Manufacturers Association -- has been active in drafting the CWC and, presumably, its members are familiar with its terms.

CENTERFORSECURITYPOLICY: A Noxious Arms Control Treaty

The supply chain starts with local farmers, who harvest the leaves in August, when they are richest in artemisinin, and sell then to a handful of companies, mainly Chinese, which extract the chemical and change it into one of the more active derivatives.

ECONOMIST: Treating malaria

And it's believed that the high chemical reactivity of the surface is due to the deposition of chemically active gases from the atmosphere onto the surface, gases like hydrogen peroxide and ozone.

NPR: Revisiting the Viking Missions to Mars

Not only did it increase production of a chemical which attracts "killer T cells" to the tumour site, it also switched these cells into an active state once they arrived.

BBC: NEWS | Health | Immune boost 'widens cancer fight'