🚀 go-pugleaf

I have a question on the longtable enviroment.  I want to put
pictures in my table.  I am making a table of chemical properties
for my thesis.  I would like to put the molecule and its properties
next to each other.  Here is a trial case.

\begin{longtable}[c]{|c|l|}
\caption[Geometry Tables]{Experimental and Optimized Geometries} \\ \hline
\endfirsthead
\caption[]{(continued)} \\ \endhead \hline
 \begin{picture}(50,50)(0,0)
 \put(25,25){\line(1,1){40}}
 \end{picture}
 &
 \begin{tabular}{l|r|r|c}
 A & 1.0 & 1.5 & a \\
 B & 2.0 & 2.1 & \\
 \end{tabular}
\end{longtable}

But, this do not line up the picture with the text.
This is what it produced.

         --------------------------------
         |          |                   |
         | -------  |                   |
         |          |                   |
         |          | A | 1.0 | 1.5 | a |
         |          | B | 2.0 | 2.1 |   |
         --------------------------------

I woulk like to be able to do this.

         --------------------------------
         |          | A | 1.0 | 1.5 | a |
         | -------  | B | 2.0 | 2.1 |   |
         |          |   |     |     |   |
         --------------------------------

Any help would be greatly appreciated!  Thanks in advance!

- CGP -