A bioperformance enhancing adjuvant of.Formula (I) R1O[BO]n[AO]mR2 where BO isbutylene oxide; and eachAO is independently propylene oxide or ethylene oxide; n is from 1 to 12; m isfrom 0 to 20; R1 is optionally substituted C4-20alkyl or optionally substituted C4-20 alkenyl; and R2 is hydrogen oroptionally substituted C1-3 alky.