Hello,

I'm curious if slightly changing the SPARQL query can have an impact
on performance, maybe you could try something like:

where {
    ?object MKG:English_name 'Pyrilamine' .
    ?RelAttr owl:annotatedTarget ?object ;
             owl:annotatedSource ?subject ;
             owl:annotatedProperty ?rel ;
             MKG:pyear '1967' .
    }

?

Best,
-- 
Elie

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