The main purpose of this study is to compare the bioavailability of 3 different formulations of LY4100511 and if the use of a proton pump inhibitor (PPI) alters the bioavailability of the 3 different formulations.

Inclusion Criteria:

• Body mass index between 18.0 and 32.0 kilograms per meter squared (kg/m2), inclusive, and a body weight of ≥50 kg.
• In good health, as determined by no clinically significant findings from medical history, 12-lead electrocardiogram (ECG) and vital signs measurements, and clinical laboratory evaluations (congenital nonhemolytic hyperbilirubinemia [e.g., suspicion of Gilbert's syndrome based on total and direct bilirubin] is not acceptable) at screening and check-in, and from the physical examination at check-in, as assessed by the Investigator (or designee).

Exclusion Criteria:

• Have a 12-lead ECG abnormality that, in the opinion of the Investigator,

  • increases the risk associated with participating in the study
  • may confound ECG data analysis
  • a QTcF: >450 millisecond (msec) for males, or >470 msec for females
  • short PR interval <120 msec or PR interval >220 msec
  • second or third degree atrioventricular block
  • intraventricular conduction delay with QRS >120 msec
  • complete right bundle branch block
  • left bundle branch block, or
  • Wolff Parkinson-White syndrome

• Have a current or recent acute, active infection (for example, for a least 30 days before screening and up to Day -1, participants must have no symptoms or signs of infection in the absence of any anti-infective treatment).

• Had any malignancy within the past 5 years. Exceptions: successfully treated basal cell skin carcinoma or squamous cell skin carcinoma, with no evidence of recurrence or metastatic disease within the 3 years prior to baseline.

• Have inflammatory bowel disease (IBD), including ulcerative colitis or Crohn's disease.