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Home › 3-Substituted-7-alkoxy-spiro(2H -1-benzopyran-2,3'-(3H)-naphtho(2,1-B)pyrans)

3-Substituted-7-alkoxy-spiro(2H -1-benzopyran-2,3'-(3H)-naphtho(2,1-B)pyrans)

US Patent 4382134 · Granted May 3, 1983

Estimated economic value: $6,351,000 ⓘ

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