Brassinosteroids 10 article 6 synthesis 6 unclassified drug 6 28 homocastasterone 4 28-homocastasterone 4 5F-HCTS 4 Bioactivity 4 Hormones 4 Magnetic Resonance Spectroscopy 4 Molecular Structure 4 brassinosteroid 4 fluorination 4 rice 4 22,23 dihydroxy 3alpha fluorostigmastan 6 one 2 22,23 dihydroxy 3beta fluorostigmastan 6 one 2 22-hydroxylated brs 2 24 ethylbrassinosteroid derivative 2 24 methylbrassinosteroid derivative 2 28 homobrassinolide 2 28 homoteasterone 2 28 homotyphasterol 2 28-HCTS 2 28-Homobrassinolide 2 28-Homocastasterone 2 2alpha, 3alpha difluoro 22,23 dihydroxy 5alpha stigmastan 6 one 2 2alpha,3alpha difluoro 5alpha stigmast 22 en 6 one 2 3,3 difluoro 22,23 dihydroxy 5alpha stigmastan 6 one 2 3,3 difluoro 5alpha stigmast 22 en 6 one 2 5F-28-homocastasterone 2