The exact sequence would be something like
(cadr (cadddr (car lst)))
but dealing with return values from SSNAMEX it would be a good idea to check which kind of pick was made because the output varies. So first check the CAR element, for example:
(setq ssxlist (ssnamex sset a))
(if (= (car (setq slist (car ssxlist))) 1)
(setq ppoint (cadar (reverse slist))))