FURUKAWA, H., ITOIGAWA, M., KUMAGAI, N., ITO, K., MCPHAIL, A., & ONAN, K. (1978). Isolation and structure determination of 4-O-tigloyl-11,13-dihydroautumnolide, a new sesquiterpene lactone from North Carolina Helenium autumnale L. Chemical and Pharmaceutical Bulletin, 26(4), 1335–1337. https://doi.org/10.1248/cpb.26.1335

FURUKAWA, H. I. R. O. S. H. I., M. A. S. A. T. A. K. A. ITOIGAWA, N. O. B. U. K. O. KUMAGAI, K. A. Z. U. O. ITO, A. N. D. R. E. W. T. MCPHAIL, and K. A. Y. D. ONAN. “Isolation and structure determination of 4-O-tigloyl-11,13-dihydroautumnolide, a new sesquiterpene lactone from North Carolina Helenium autumnale L.” Chemical and Pharmaceutical Bulletin 26, no. 4 (1978): 1335–37. https://doi.org/10.1248/cpb.26.1335.

FURUKAWA H, ITOIGAWA M, KUMAGAI N, ITO K, MCPHAIL A, ONAN K. Isolation and structure determination of 4-O-tigloyl-11,13-dihydroautumnolide, a new sesquiterpene lactone from North Carolina Helenium autumnale L. Chemical and Pharmaceutical Bulletin. 1978;26(4):1335–7.

FURUKAWA, H. I. R. O. S. H. I., et al. “Isolation and structure determination of 4-O-tigloyl-11,13-dihydroautumnolide, a new sesquiterpene lactone from North Carolina Helenium autumnale L.” Chemical and Pharmaceutical Bulletin, vol. 26, no. 4, Pharmaceutical Society of Japan, 1978, pp. 1335–37. Crossref, doi:10.1248/cpb.26.1335.

FURUKAWA H, ITOIGAWA M, KUMAGAI N, ITO K, MCPHAIL A, ONAN K. Isolation and structure determination of 4-O-tigloyl-11,13-dihydroautumnolide, a new sesquiterpene lactone from North Carolina Helenium autumnale L. Chemical and Pharmaceutical Bulletin. Pharmaceutical Society of Japan; 1978;26(4):1335–1337.