Fucoxanthin is a natural product that is from a class known xanthophylls. The compounds give rise to the orange and red colors from carrots and tomatoes. This one can be found in brown seaweed. Fucoxanthin has been touted as a weight loss supplement, but beware, the studies were done on rats! Non-bonding electrons have been purposely left out. a. Please fill in the table below: Molecular formula Number of: pi bonds pi orbitals sp carbons sp carbons sp carbons aldehydes non-bonding pairs of electrons ketones alcohols amines ethers carboxylic acids esters b. Chiral centers maximum no. of stereoisomers Label each chiral center with an asterisk. (graded right - wrong). There are more than 2 chiral centers. Pick ONLY 2 of them and label them as R or S. The natural isomer (+) has a specific rotation of + 72.5. Suppose you have a mixture of the natural isomer and its enantiomer that gives and observed rotation of -24.2%. Which enantiomer is in excess? Calculate the enantiomeric excess. Calculate the composition of the mixture (percent of each enantiomer). SHOW YOUR WORK. Make sure you indicate clearly which answer is which. HO Fucoxanthin HO