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digitalmars.D - inline assembler interrupts

I'm trying to call dos interrupts using the inline assembler.
Unfortunately I keep getting the following message during compilation:
end of instruction
The code I used is listed below. Any help is welcome.
asm
{
mov AH, interrupt_code ;
int 21H                ;
..
}
where interrupt_code is of type long. 
Jun 27 2006