Global 4-Vinyl Guaiacol (CAS 7786-61-0) Market By Type (Purity: 95% , Purity: 99% , and Other), By Application (Cosmetics , Synthetic Fragrances , Pharmaceuticals , and Food Additives), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028