E: Malfored entry 1 in list file /etc/apt/sources.list.d/virtualbox.list (Suite) E: The list of sources could not be read

Question

I was installing virtualbox and when i enter this:

$ echo "deb {arch=amd64} http://virtualbox.org/virtualbox/debian
> (lsb_release -cs)contrib
> (lsb_release -cs) contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list

This showed:

[sudo] password for marie: 
deb {arch=amd64} http://virtualbox.org/virtualbox/debian
(lsb_release -cs)contrib
(lsb_release -cs) contrib

I then try to do:

$ sudo apt-get update
Malformed entry 1 in list file /etc/apt/sources.list.d/virtualbox.list (Suite)
E: The list of sources could not be read.

Can someone help me please?