Stability and Antioxidant Activity of Semi-synthetic Derivatives of 4-Nerolidylcatechol oleh Emerson Silva Lima, Ana Cristina Silva Pinto, Karla Lagos Nogueira, Luiz Francisco Rocha e Silva, Patricia Danielle Oliveira de Almeida, Marne Carvalho de Vasconcellos, Francisco Celio Maia Chaves, Wanderli Pedro Tadei, Adrian Martin Pohlit