| 摘要 |
<p>This invention provides new compounds of formula I, I wherein n is a whole number from 1 to 3, R1 is hydrogen, or halogen of atomic number from 9 to 35, each of the two radicals R2 are the same, and each is hydrogen or alkyl of 1 to 4 carbon atoms, each of tho two radicals R3 are tho same, and each is hydrogen or alkyl of 1 to 4 carbon atoms, and X is carbonyl or methylene , useful as anti-arrhythmics.</p> |
