Abstract: Provided herein is a derivative of 2-deoxy-2-amino-4-O-phophono-D-glucopyranose, which is derived from lipid A, of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are a member in a pair selected from the group consisting of those indicated in a following table:______________________________________ Com- pound No. R.sub.1 R.sub.2 ______________________________________ I(R,R) --O--CO--(CH.sub.2).sub.12 --CH.sub.3 --O--CO--(CH.sub.2).sub.12 --CH.sub.3 II --O--CO--(CH.sub.2).sub.12 --CH.sub.3 --OH II(R,R) --O--CO--(CH.sub.2).sub.12 --CH.sub.3 --OH II(S,S) --O--CO--(CH.sub.2).sub.12 --CH.sub.3 --OH III --OH --O--CO--(CH.sub.2).sub.12 --CH.sub.3 III(R,R) --OH --O--CO--(CH.sub.2).sub.12 --CH.sub.3 III(S,S) --OH --O--CO--(CH.sub.2).sub.12 --CH.sub.3 IV(R) --H --O--CO--(CH.sub.2).sub.12 --CH.sub.3 ______________________________________The compounds of this invention include those of rectus and sinister configurations and act as mitogens for polyclonal B cells.

Abstract: Provided herein are two kinds of toxoid of elastase of Pseudomonas aeruginosa origin, one of which is obtained by treating a purified elastase produced from Pseudomonas aeruginosa with a synthetic peptide for chloroacetyl-N-hydroxy-L-leucyl-L-alanylglycinamide and the other of which is obtained by treating at first with formalin, then, with the synthetic peptide. The present invention also contemplates a method for preparing the toxoids and the use of such toxoids for preventing and treating infections caused by Pseudomonas aeruginosa on human beings and mammalian animals. Acute toxicity of the toxoids is inspected.