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US 4,395,556 AGranted
Nitrobenzofurazan derivatives
AssigneeE. R. Squibb & Sons, Inc.
InventorsCallixtus E. Ita, Anthony F. Heald, Peter Egli
Life of this patent
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Abstract
Nitrobenzofurazan derivatives having the formula ##STR1## are provided wherein R.sub.1 and R.sub.2 each is hydrogen, lower alkyl or phenyl-lower alkyl; R.sub.3 is hydrogen, hydroxy or lower alkyl; R.sub.4 is hydrogen or lower alkyl; m is 2 or 3; and n is 0, 1 or 2; these compounds are useful analytical tools.
Claims4
A compound having the formula ##STR10## or a salt thereof, wherein R.sub.1 and R.sub.2 each is hydrogen, lower alkyl or phenyl-lower alkyl;
- R.sub.3 is hydrogen, hydroxy or lower alkyl;
- R.sub.4 is hydrogen or lower alkyl;
- m is 2 or 3;
- and n is 0, 1 or 2.
1 more element
Dependencies are inferred from the claim text.