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Помогите пожалуйста найти методы синтеза данного соединения

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SPRESI:

1. Satyanarayana V., Rao Ch. Prasad, Krupadanam G. L. David, Srimannarayana G.:
A new and facile synthesis of chroman-3-ols, 3,4-dihydro-2H-[1]-benzopyran-3-ols
Synth. Commun., 21 (1991) N 14, S 1455-1464

2. Eguchi Hisao, Tokumoto Katsumi, Shuyama Hideo:
<No title available>
Toso kenkyu hokoku (J. Tosoh Res), 37 (1993) N 2, S 109-116

3.AIG, EDWARD R.;COFFEY, JOHN W.;LOVEY, ALLEN J.;ROSENBERGER, MICHAEL:
US/4883614: PHENYL SUBSTITUTED-2,4,6,8-NONATETRAENOIC ACID

4.AIG, EDWARD R.;COFFEY, JOHN W.;LOVEY, ALLEN J.;ROSENBERGER, MICHAEL:
US/4883613: PHENYL SUBSTITUTED-2,4,6,8-NONATETRAENOIC ACID

5.AIG, EDWARD R.;COFFEY, JOHN W.;LOVEY, ALLEN J.;ROSENBERGER, MICHAEL:
US/4780251: PHENYL SUBSTITUTED-2,4,6,8-NONATETRAENOIC ACID

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