how to get accounts contacts and products details

how to get accounts contacts and products details

  1. accountlist = zoho.crm.getRecords(("Accounts"), 1, 200);
  2. ac = List();
  3. for each accounts in accountlist
  4. {
  5.    ac.add((accounts).get(("Account Name")));
  6. }

we want to get account related  products and put those product names in accounts related contacts/lead.
so how to get accounts related  products  and put in accounts related contacts multi select field