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That’s just what his team did, using two old drugs - the sedative amobarbital, known to inhibit cellular energy generation, and an antioxidant named N-acetylcysteine - to aim at different parts of that cycle.

The Berkeley Law Death Penalty Clinic, which opposes executions, says amobarbital and secobarbital have never been used in executions.

If secobarbital is so expensive, why not use one of the other barbiturates such as pentobarbital or butabarbital or amobarbital?

The plan would let corrections officials choose between four powerful barbiturates - amobarbital, pentobarbital, secobarbital or thiopental - for each execution, depending on which one is available.

The regulations would let corrections officials choose between four types of powerful barbiturates - amobarbital, pentobarbital, secobarbital or thiopental - before each execution, depending on which one is available.