What does carton want from Solomon pross?

In Charles Dickens' "A Tale of Two Cities," Sydney Carton seeks to redeem himself and find purpose through his relationship with Solomon Pross, also known as "Barsad." Carton ultimately desires to leverage Pross's connections and knowledge to help save Charles Darnay, the man who married Lucie Manette, the woman Carton loves. His deeper motivation is to demonstrate his capacity for sacrifice and nobility, contrasting with his previously wasted life.