You can say:
>> parse ['<end> asdf] [''<end> to <end> <input>]
== ['<end> asdf]
Or alternately, you can use LITERAL:
>> parse ['<end> asdf] [literal '<end> to <end> <input>]
== ['<end> asdf]
Abbreviated:
>> parse ['<end> asdf] [lit '<end> to <end> <input>]
== ['<end> asdf]