| http://www.w3.org/ns/prov#value | - la ##STR1## wherein R represents hydrogen, phenyl, loweralkyl or loweralkyl carbonylamido; R1 represents morpholino (4-morpholinyl) or piperidino (1-piperidinyl) and R2 represents hydrogen or loweralkyl, with the proviso that at least one of R and R2 is a moiety other than hydrogen and with the further proviso that when R is phenyl, R1 is morpholino and R2 is loweralkyl.
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