diff --git a/src/Parse.jl b/src/Parse.jl
index 0c3fd4b0..b23fee1a 100644
--- a/src/Parse.jl
+++ b/src/Parse.jl
@@ -166,14 +166,10 @@ export getatomdictsmiles
 getatomdictinchi(inchi) = getatomdictfromrdkit(Chem.AddHs(Chem.MolFromInchi(inchi)))
 export getatomdictinchi
 function getatomdictadjlist(adjlist)
-    try
-        mol = species.Species().from_adjacency_list(adjlist).molecule[1]
-    catch
-        @error("Unable to parse adjlist $adjlist")
-    end 
-    if isa(mol, molecule.Molecule)
+    mol = species.Species().from_adjacency_list(adjlist).molecule[1]
+    if pybuiltin(:isinstance)(mol, molecule.Molecule)
         getatomdictfromrmg(mol)
-    elseif isa(mol, fragment.Fragment)
+    elseif pybuiltin(:isinstance)(mol, fragment.Fragment)
         mol.assign_representative_molecule()
         getatomdictfromrmg(mol.mol_repr)
     else