turtle parser fails to parse "<" under some circumstances

As described. Given turtle file:
```
@prefix qudt: <http://qudt.org/schema/qudt/> . 
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . 
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . 
 
qudt:IntervalScale 
  rdfs:comment "(<"^^rdf:HTML .
```

The parsing with `Graph().parse("myfile.ttl")` fails.