Should I use a class as a wrapper?

Lets say I have a class representing a chemical compound

class Compound(networkx.Graph): 

    def __init__(self):
        super(Compound, self).__init__()

And lets say that I want to add some extra functionality onto a chemical compound. It should probably inherit from Compound. But is it okay to just use it as a wrapper for Compound? For example

class Acid(Compound):

    def __init__(self, compound, *other_data):
        self.__dict__.update(compound.__dict__)

Basically, this class would just have pointers to the underlying class and then let me add functionality without having to copy things. Does this make sense? Is it reasonable? Am I even doing it right?