This is the structure of Vitamin A:
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A six membered ring with a methyl group on the first carbon (bottom  right),
two hydrogens on the second carbon (bottom), two hydrogens on the third carbon
(bottom left), two hydrogens on the fourth  carbon (top left), and two methyl
groups on the fifth (top) carbon.  the sixth carbon is double bonded to the
first carbon (the one at the bottom right with the methyl group). This sixth
carbon also has a single bond to another carbon, which starts a chain. This
chain consists of  nine carbon atoms (not counting the carbon which is a part
of the ring). The first carbon of this side chain has one hydrogen and is
double bonded to the second in the chain. The second has a single hydrogen, and
is single bonded to the third carbon in the chain. This third carbon has a
methyl group and is double bonded to the fourth carbon of the side chain. The
fourth carbon has a single hydrogen atom, and is single bonded to a fifth
carbon. The fifth carbon has only one hydrogen atom too, and is double bonded
to the sixth which also only a single hydrogen atom. The sixth carbon atom of
the side chain is single bonded to the seventh, which has a methyl group and is
double bonded to the eighth carbon atom of the chain. Finally the eighth carbon
atom (which has a single hydrogen carbon attached) is single bonded to the the
ninth and last carbon atom of the side chain which has two hydrogen atoms
attached and one alcohol group. Methyl groups consist of one carbon with three
hydrogen atoms attached. An alcoholic group consists of a single oxygen atom
bonded to a single hydrogen atom.

Roughly, Vitamin A looks like this in ASCII art:

     CH3 CH3
     H \ /       H     CH3   H     CH3 H
   H-C--C--C--C==C--C==C--C==C--C==C---C--OH
     |     || H     H     H     H      H
   H-C--C--C--CH3
     H H H


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