Abstract: Amidinophenol derivatives of the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are (i) H, (ii) C1-4 alkoxy, (iv) C2-5 acyl, (v) halogen, (vi) NO.sub.2, (vii) benzoyl, (viii) COOR.sup.4 (in which R.sup.4 is C1-3 alkyl); A is bond, C1-4 alkylene, --C(R.sup.5).dbd.C(R.sup.6)--(in which R.sup.5 and R.sup.6 are H or C1-4 alkyl; R.sup.3 is (i) CON(R.sup.7)(R.sup.8), (ii) CON(R.sup.9)--CH(R.sup.7)(R.sup.8) or (iii) ##STR2## in which R.sup.7 and R.sup.8 are (1) H,(2) phenyl, (3) C7-10 phenylalkyl, (4) phenyl or C7-10 phenylalkyl substituted by 1 or 2 C1-4 alkyl, halogen or R.sup.11 --COOR.sup.12 (in which R.sup.11 is bond, C1-8 alkylene, C2-8 alkenylene, C2-8 alkynylene; R.sup.12 is H, C1-4 alkyl, C7-10 phenylalkyl, phenyl, allyl, propargyl), (5) C1-10 alkyl, (6) C2-10 alkenyl having 1 to 3 double bonds, (7) C2-10 alkynyl having 1 or 2 triple bonds, (8) R.sup.11a --COXR.sup.12 (in which R.sup.