... T. SUNJIC~ Research-Development Instztute, Ki ka, Pha, niaceirttcal and Chemical Works, Soeo Jlesto, I'irgoslnn ia Received -4zrgust 4, 1969 h1. ... The most active sub- stances were 1 and 13 which reduced the hemagglutinins of influenza A, virus in allantoic fluidf 20-fold. ...