json - Error with specific name using rest client builder in grails 2.3.4 -

i'm using rest-client-builder:1.0.3 grails plugin communicate rest api dspace. works well:

def resp = rest.post("http://10.42.0.239:8080/rest/login"){         contenttype "application/json"         json{             email = "myemail@mail"             password = "root"         }     } 

but need send parameter minus sign in way:

def status = rest.get("http://10.42.0.239:8080/rest/status"){             contenttype "application/json"             json{                 rest-dspace-token = "4506b187-bda8-4db7-801d-635f277d5316"             }         } 

minus signs in rest-dspace-token give next error:

((rest - dspace) - token) binary expression, should variable expression @ line 

how can solve ? in advance.

just quote property of delegate:

        json{             delegate.'rest-dspace-token' = "4506b187-bda8-4db7-801d-635f277d5316"         }