Hydrafinil is an alcohol derivative of fluorene. In the most significant isomer, fluoren-9-ol or 9-hydroxyfluorene, the hydroxy group is located on the bridging carbon between the two benzene rings. Hydroxyfluorene can be converted to fluorenone by oxidation. It is a white-cream colored solid at room temperature. 
Hydrafinil is an alcohol derivative of fluorene and is being clasisfied as a eugeroic compound, promoting wakefulness. The company Cephalon investigated Fluorenol in comparison to the popular eugeroic drug  In their comparison research with rodents, they noted that Fluorenol was significantly more effective than (up to 39%). Although it has dopamine reuptake properties, they tend to be pretty weak.
Hydrafinil, also known by its name 9-Fluorenol, is a eugeroic drug. state that it is more effective at keeping the target of the drug awake. Hydrafinil is a weaker dopamine reuptake inhibitor.
Hydrafini, Fluorenol is an alcohol derivative of fluorene. In the most significant isomer, fluoren-9-ol or 9-hydroxyfluorene, the hydroxy group is located on the bridging carbon between the two benzene rings. Hydroxyfluorene can be converted to fluorenone by oxidation.

1.Mood Enhancer: Hydrafinil might be more serotonergic than different eugeroics, its ability to enhance state of mind might be much better than related substances.
2.Less stimulating: Users state that hydrafinil is likely less empowering than different eugeroics. This implies it might be more less likely to cause tension, jitters, and/or other adverse reactions.
3.Subtler impact: The general impact of hydrafinil is thought to be more subtle and "cleaner" than different eugeroics.
4.Increase attentiveness: Hydrafinil might really maintain alertness for a more extended time.

1.Applied in health product field; 
2.Applied in medical field;