What is the highest number of the match with julio césar vásquez as the opponent?
CREATE TABLE "list_of_boxing_quadruple_or_four_divisio" (
  "number" real,
  "name" text,
  "titles" text,
  "date" text,
  "opponent" text,
  "result" text
);
SELECT MAX("number") FROM "list_of_boxing_quadruple_or_four_divisio" WHERE "opponent"='julio césar vásquez';