| http://www.w3.org/ns/prov#value | - The benzopyran of claim 2 wherein each R1 is formyl, methyl, methoxycarbonyl, methylaminocarbonyl, or methoxy; each R2 is methyl, methoxy, or fluoro; each R3 is methyl or methoxy; R4 is a methyl; and each R5 is a formyl, methyl, methoxycarbonyl, methylaminocarbonyl, or methoxy.
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