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It may also be possible to directly detect the parent compound—the Novichok itself—in Navalny’s body.

Remdesivir’s parent compound GS-441524 was invented around 2009 when Gilead was looking for drugs to treat hepatitis C, according to Gilead.

Remdesivir’s parent compound GS-441524 was invented about 2009 when Gilead was looking for drugs to treat hepatitis C, according to Gilead.

Like cigarettes, they contain nicotine, but not its parent compound, tobacco, which kills up to half its users.

In the case of AMB-FUBINACA, the chemical in the biological sample from Brooklyn wasn’t the parent compound.