| abstract |
Subject of the present invention are new ureido derivatives of naphthalenephosphonic acids having the following formula (I) ##STR1## wherein each of m and n, which are the same, is an integer of 1 to 4; each of p and q, which are the same, is an integer of 1 to 3; and each of the R groups, which are the same, is a free or esterified phosphonic acid group; and the pharmaceutically acceptable salts thereof. |