code: public static IReaction getReactionByAtomContainerID(IReactionSet reactionSet, String id) {
          for (IReaction reaction : reactionSet.reactions()) {
              if (AtomContainerSetManipulator.containsByID(reaction.getProducts(), id)) return reaction;
          }
          for (IReaction reaction : reactionSet.reactions()) {
              if (AtomContainerSetManipulator.containsByID(reaction.getReactants(), id)) return reaction;
          }
          return null;
      }
docs: Gets a reaction from a ReactionSet by ID of any product or reactant. If several exist,
  only the first one will be returned.
  
  @param reactionSet The reactionSet to search in
  @param id The id to search for.
  @return The Reaction or null;