Table 2. Radical inhibition of the selenosulfonation of cyclopropylacetylene by carvedilol (1), its metabolites 4–6 and benchmark compounds 9–11.

Compound	t 1/2 (min)	Time to completion (min)
No inhibitor	4.6	30
BHT (9)	7.9	45
4-Hydroxycarbazole (10)	32.4	90
α-Tocopherol (11)	27.8	60
Carvedilol (1)	4.6	30
4′-Hydroxycarvedilol (4)	8.7	45
5′-Hydroxycarvedilol (5)	13.8	90
3-Hydroxycarvedilol (6)	64.6	180