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Chemical constituents from stems of Hedyotis hedyotidea and their immunosuppressive activity Chemical constituents from Spiraea pubescens Chemical constituents of Corydalis decumbens Studies on chemical constituents from fresh pineneedles of Pinus massoniana Non-alkoloids components from Phellodendri Cortex Chemical constituents of Euphorbia royleana Study on chemical constituents from whole herbs of Xanthium mongolicum