Connect GG23 to a classical architecture GG19

Hello community ,
I have a question : I am trying to extract from a PstgreSQL using Oracle Golden Gate 23 and I need to replicate changes on a Oracle 12.2 DB , on a server where is installed Golden Gate 19 classic architecture.

I am trying to follow this :

 https://docs.oracle.com/en/middleware/goldengate/core/23/coredoc/reference-connecting-ma-classic.html

But I don't know what kind of alias to enter when creating the distribution path ( step 3 of the wizard ) :

I created an alias to allow access to server with OGG19 like this :

OGG (http://src_server_ogg23:9000/ ams) 4> ALTER CREDENTIALSTORE ADD USER oracle ALIAS ogg19conal DOMAIN Network PASSWORD "****"