Study on Hibiscus rosa-Sinensis (hibiscus flower) to counter effect ROS and remediation characteristics with respect to human keratinocyte cells

Study on Hibiscus rosa-Sinensis (hibiscus flower) to counter effect ROS and remediation characteristics with respect to human keratinocyte cells
What molecule within hibiscus flower can counter the effect of ROS generation
I. explain the chemical reaction how ROS is reversed.
II. ROS structure of compound, suggested chemical structure of inactivating oxidative activities
III. explain / deduce biochemistry mechanism ,
IV. how the molecules counter effect ROS/ toxicity.
V. Explain the potency of it.