FIELD: organic chemistry, antibiotics. SUBSTANCE: invention relates to novel cephalosporins and complexes carbocephalosporin/para-aminobenzoic acid, methods of their synthesis, isolation and purification of antibiotics containing beta-lactam ring. Invention describes complexes of the formula (I) 
where X means chlorine, hydrogen atom, vinyl or -CH3; Z means CH2, S- or O-atom; n = 0-5; Y means phenyl or 1,4-cyclohexadiene-1-yl; R1 and R2 mean hydrogen atom or hydroxy-group at condition the they both (R1 and R2) are not hydrogen atom; and R3 means -COOH, -COO-(C1-C4)-alkyl or 
where R4 means C1-C4-alkyl. EFFECT: new cephalosporins and complexes indicated above. 6 cl, 1 tbl, 19 ex
