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HELVETICA CHIMICA AC 50 JOURNAL OF NATURAL P 25 PHYTOCHEMISTRY 23
JOURNAL OF ASIAN NAT 21 TETRAHEDRON 11 CHEMICAL & PHARMACEU 7
ORGANIC LETTERS 7 STEROIDS 6 JOURNAL OF AGRICULTU 5
TETRAHEDRON LETTERS 5 ZEITSCHRIFT FUR NATU 5 CHEMISTRY OF NATURAL 4
BIOORGANIC & MEDICIN 3 JOURNAL OF THE BRAZI 3 BIOORGANIC & MEDICIN 2
CHINESE JOURNAL OF C 2 EUROPEAN JOURNAL OF 2 JOURNAL OF ANTIBIOTI 2
MAGNETIC RESONANCE I 2 CANADIAN JOURNAL OF 1