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Compounds of the formula wherein one of A and B is methenyl (-CH=) and the other is carbonyl; R1 is (alkyl of 1 to 3 carbon atoms)mercapto, (alkyl of 1 to 3 carbon atoms)sulfinyl or (alkyl of 1 to 3 carbon atoms)sulfonyl; and R2 is alkoxy of 1 to 3 carbon atoms; tautomers thereof, and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds are useful as cardiotonics.

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